Superboy of the Legion of Super-Heroes
Superboy
Name: Clark Kent (born Kal-El)
Home Planet: 20th c. Earth (born on Krypton)
Super-Powers: Super-strength, speed, invulnerability, flight, super-senses, etc.
Member Since: 2962

Origin | Super-Powers | Personal Data | Membership Record

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Origin

Kal-El was born on Krypton, a planet of giant size revolving around a red sun. Because Krypton had a core made of radioactive uranium, internal stresses started a chain reaction that the infant's father predicted would explode like a gigantic atomic bomb. The Council of Scientists scoffed at Jor-El, preferring to believe in their Cosmic Clock, which predicted safety for their world. Nobody believed Jor-El except his brother, Zor-El, who agreed that unless space-arks were built, all would die when the day of doom came.

Barely in time before the fatal hour, Jor-El and Lara placed their son, Kal-El, in a small rocket and launched him towards the planet Earth. His rocket crash-landed outside of Smallville, where a passing farm couple, Jonathan and Martha Kent, found the infant. Later, they adopted him and named him Clark, after Martha's maiden name.

Under the influence of Earth's lesser gravity and the rays of its yellow sun, baby Clark soon began to display amazing powers. After selling their farm and moving to Smallville, Jonathan Kent opened up a general store and Clark started school. As the lad grew up, he gained full control of all his great powers and, as Superboy, began his public career as a super-hero (Superman No. 146, and others).

Superboy recalls his origin

First Appearance: (In the Weisinger Era / Silver Age) Superboy No. 64 and Adventure Comics No. 247 (both Apr. 1958)

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Super-Powers

"Superboy came from the planet Krypton, which has a red sun. He derived his super-powers of invulnerability, flying, super-strength, super-speed, X-ray vision, heat vision, etc. from Earth's yellow sun."

- Adventure Comics No. 316 (Jan. 1964) "Origins and Powers of the Legion of Super-Heroes"

Superboy flies through the cosmos at super-speedAs Superboy himself once explained: "Born on a giant world with a heavy gravity, my muscles automatically become super-strong in Earth's light gravity." From this source, he attributed his muscular powers of super-strength, super-breath, super-speed, and flying (Superman No. 146). Further experience on Superboy's part, however, has showed him that his flying power is partially derived from the yellow sun source (Superboy No. 141). In some texts, the role that gravity plays on any of his powers is often omitted, attributing them entirely to the sun's yellow rays (Adventure Comics No. 329 "Know Your Legionnaires"), but the truth remains that his coming from a heavy-gravity world does indeed factor into the explanation of his great powers (see related section below). According to Superman it is the combination of Earth's lesser gravity and yellow sun that gives him his super-powers (Superman No. 141).

To Superboy, pressing 10 million pounds (5,000 tons) with one hand is "a cinch" (Adventure Comics No. 361). It is also an easy trick for him to apply the pressure of 50,000 atmospheres, the force of a meteor strike, to a piece of coal in one clenched hand and transform it into a diamond. Even his super-breath is powerful enough to nudge a planet through space (293), or freeze the air around objects. He can hold his breath within his super-lungs for an indefinite period of time.

In regards to his invulnerability, Superboy surmised that "yellow-sun rays, which only tan Earth people's skin, hardened mine like steel. Radium rays... lightning... fire... nothing can harm me (Superman No. 146)." Superboy is invulnerable not only to these, but to blades, projectile weaponry, and even the intense heat and forces generated by an exploding sun (Superboy No. 117).

Superboy can fly at velocities thousands of times the speed of light, able to whisk off to distant stars in seconds. Combined with his invulnerable body, his great speed is able to propel him through the time-barrier to fly into either the past or future. At full flight speed, hurling his densely-packed body at full force, Superboy can strike with the power of 1,000 H-bombs (Adventure Comics No. 366) - over a billion tons of TNT. Superboy only wears his Legion flight-ring to send and receive emergency signals to and from other wearers (369, 372 "The Legion Outpost").

Superboy has also pointed out that: "... Only the ultra solar rays of Earth's yellow sun can super-energize my brain and five senses to give me the other, non-muscular super-powers" - super-senses and mental powers such as x-ray vision, telescopic vision, microscopic vision, super-hearing, super-memory, and super-calculation (Superman No. 146).

Superboy's x-ray vision enables him to see through objects but to also activate some machines - such as his Superboy robots. His x-ray vision can fog photographic film (Superboy No. 98). Ordinary x-rays cannot penetrate Superboy's body but Ultra Boy's penetra-vision can (Adventure Comics No. 350).

Superboy can increase the thermal energy generated by his x-ray vision to heat or melt objects. Later referred to as "heat vision", it cannot affect or harm his own body; it takes the combined vision of two super-beings to, say, cut his hair or trim his fingernails (Superman No. 139). It should be noted that Superboy's hair and nails do not normally grow under a yellow sun.

Superboy uses his super-visionSuperboy's telescopic vision can see millions of miles across space to view individuals on other worlds. By combining his x-ray vision and telescopic vision, Superboy's "super-vision" can search for specific things or people all over the globe. Superboy can use his microscopic vision to see fingerprints and even detect an object's molecular composition.

Superboy's aural and olfactory senses are also super-sensitive - with his super-hearing able to pinpoint the tiniest sounds made many miles away and his super-senstive nostrils able to pick up on the faintest of odors.

Superboy's super-brain can memorize vast encyclopedias worth of knowledge and has the power of instant total recall. He can also work out complex mathematical formulae in seconds. Combined with his super-speed, Superboy can construct complex mechanical devices in seconds. His greatest invention is his Superboy Robots, which can duplicate most of his powers to a limited degree, even time-travel (Adventure Comics No. 302). They are not invulnerable, however, and can be short-circuited or made inoperable by various environmental conditions.

Without Superboy's super-brain, able to calculate the precise amount of power necessary to do normal-scale tasks, he would not be able to function safely as the boy of Steel. From picking up a pencil as Clark Kent or catching a person who is falling as Superboy, he would be a hazardous destructive force if he were not in control of his great super-powers.

Superboy also possesses a super-voice, which he can use for super-ventriloquism or hypnosis. His super-loud shouts can cause vibrations that can alter the molecular structure of some substances. Unfortunately, he cannot work this trick with kryptonite, since nearness to the deadly substance makes him too weak to shout (Adventure Comics No. 267).

Limitations and Weaknesses: Superboy's x-ray vision cannot penetrate lead or lead-lined walls. It also cannot penetrate inertron, the most indestructible substance in the 30th century (Adventure Comics No. 336). The heat of his x-ray vision cannot melt lead, unless it is a very thin lining (313).

Superboy cannot normally use his heat vision to melt kryptonite. By concentrating hard on nearby kryptonite for at least six agonizing minutes, the heat of his x-ray vision can suceed in melting it. Two or three minutes of concentration is not enough, however (Action Comics No. 252/1). While kryptonite can melt, it does not burn because it can't combine with oxygen. For this reason, fragments to not burn up in Earth's atmosphere and are more readily found (276/1).

Superboy suffers from kryptonite blood-poisoningKryptonite is the remants of the planet Krypton, turned radioactive and known for its signature green glow. Nearness to its radiations will rob the strength of a super-powered Kryptonian but have no effect on a non-powered Kryptonian or a person who is not from Krypton. Kryptonite radiations cannot penetrate lead, which acts as a shield against its harmful effects. Presumably, kryptonite radiations cannot penetrate the denser-than-lead bodies of other super-beings, or inerton.

The initial effects of green kryptonite on Superboy are pain, weakness, and eventual paralysis. A sustained exposure will cause a condition known as kryptonite blood-poisoning, which is typified by the victim's skin having absorbed so much deadly radiation that it turns a green pallor. If removed from kryptonite's harmful influence before his body turns completely green, the pain will ease and Superboy will rapidly regain his strength. If not, death will result. Despite Superboy's power of total-recall, repeated encounters with kryptonite have caused gaps in his otherwise super-memory (Superboy No. 106).

It should be noted that green kryptonite only saps Superboy's strength. If too close to the initial exposure, he will become too weak to crawl away to safety or use his breath to blow the rock out of range. All of his other super-powers, however, remain unaffected. For instance, he is still invulnerable to harm from all other conventional means (Superboy No. 86 and others).

After a flock of green kryptonite meteors passed through a crimson cosmic cloud it was transformed into red kryptonite, the peculiar radiations of which always have unpredictable effects on Kryptonians. It may shrink him, split him into two people, or turn him into a giant (Adventure Comics No. 315). The effects of exposure are only temporary and usually pass within a day or two. Once affected by a specific piece of red-K, he can no longer be affected by it. It can, however, act in the same exact way upon another Kryptonian.

Gold kryptonite is a rare form of the meteor, and fortunately so, since exposure to it robs a super-Kryptonian of their super-powers permanently (Adventure Comics No. 320). Blue kryptonite has no effect on Kryptonians, but will destroy imperfect, non-living Bizarro duplicates (329).

If Superboy passes through a solar system, too close to its red sun, he will quickly lose all his super-powers (Superman No. 141). He will also lose his powers on a planet under a green sun (155). He will retain his powers in an orange sun system, but at half-strength (Action Comics No. 384/1), and under a hotter blue-white sun his powers are increased (Adventure Comics No. 315 "The Legion Outpost"- an effect first theorized by reader and future writer/editor, E. Nelson Bridwell).

Superboy stands on a gravitor plateSuperboy loses his powers wherever the conditions of his home world Krypton are duplicated. He is vulnerable to objects that come from Krypton-like worlds, which also become super under a yellow sun (Adventure Comics No. 364). He can be overpowered by super-people or super-animals who would be normally stronger than he is if they didn't have super-powers.

Superboy is also vulnerable to extra-dimensional forces, such as magic (369/370).

Superboy can be hurt by heat vision more powerful than his, such as Ultra Boy's penetra-vision (Superboy No. 98). Superboy cannot break through a foot-thick slab of manganium inertron (Adventure Comics No. 367, 374), although Karate Kid has speculated that he could if he knew karate (367).

Superboy can be hypnotized (Adventure Comics No. 339), especially if kryptonite is used (349), or if it is by a fellow super-being - as in the case of Supergirl using a post-hypnotic command to make him forget her when he returns to the 1930s (341).

Speculative Explanation of Powers: Considering Superboy's almost limitless strength and vast array of powers, the role that Earth's lighter gravity plays seems almost negligible compared to the yellow sun explanation. After all, a terrestrial planet, even one with a uranium core, wouldn't have gravity much more than 5 times that of Earth's. That alone wouldn't give Superman the power to move mountains. It does, however, provide the foundation for which the "super-energy rays" of Earth's yellow sun need to work.

We know that the gravity of Krypton cannot be more than 5 times higher than on Earth because Earthlings like Jimmy Olsen have visited there. Forced to their hands and knees, unable to stand or move without the aid of special anti-gravity devices, the gravity was "tolerable" only in that it would have probably caused them to black out if it was at anything higher than 5gs.

In 2007, astronomers discovered a Krypton-like planet orbiting second out from the star Gliese 581, 20.5 light-years from Earth. This ancient and stable star, billions of years old, is a red dwarf that is 50 times cooler than our own. The planet has 1.5 times the diameter of Earth, and about 5 times the gravity. The likelihood of water and oxygen, and therefore life, existing on Gliese 581c ("the new Earth") is considered to be very good.

For a race of humanoids to evolve on a planet with a gravity like this, and to still look like an Earthling in both size and shape, means that their muscular density would have to be extremely high, at least 5 times as much. This is necessary in order to move normally at five times what their weight would be on Earth and for the toughness needed to survive falls in a gravity that high. More muscle mass to move means that a more sophisticated and "super-charged" nervous system is needed to produce the superior electrochemical signals necessary to stimulate the far denser tissue. This results in cells that are more receptive to energy absorption, and able to transmit signals at super-speed.

Transferring a person like this to a planet with a gravity 1/5th of what they are born would make him or her over a hundred times stronger, faster, and tougher compared to Earthlings. They would be able to lift cars, leap an 1/8 of a mile, and even deflect bullets with their bodies. While this may explain the Golden Age Superman's abilities to a T, something more is needed to justify the far greater powers of the Silver Age Superman.

Which leads us to Krypton's sun; at fifty times cooler than ours, a planet orbiting even as far out as Earth is from its sun, would recieve much less thermal energy and cosmic radiation. For people there to benefit from the rays of their sun, as Earthlings do when they produce vitamin D, Kryptonians would need to have skin cells that were designed to utilize the weaker rays more efficiently. They may even have organelles similar to the chloroplasts in plants that allow them to absorb light to synthesize sugars and other essential needs.

Taken to Earth, with its comparatively "ultra solar rays", a red sun being would have these solar cells literally drenched in energy. Their high-gravity nervous systems would work synergistically to avoid an energy overload by converting much of it to extra mass on an atomic level. With a molecular density many thousands of times greater, he or she would possess nearly limitless strength and become virtually invulnerable to harm. One might expect then, that a Kryptonian with so great a mass would, even on Earth, have a corresponding weight that would sending him crashing through floors. The reason it doesn't leads to the explanation of the next power.

In 1992, a Russian engineer named Eugene Podkletnov discovered that a superconductor disk (made up of large, tightly-packed atoms to allow greater electron flow) bombarded with high radiofrequency waves would allow the fast moving electrons to succeed in blocking off gravitational waves. The result was that an object placed on the disk, partially shielded from the Earth's and its own gravitational field, actually reduced in weight.

Superboy's super-dense and energy-filled body acts similarly, able to block off the effects of gravity to the extent that he only weighs a miniscule fraction of his true mass. By willing his body's electrons to move even faster, at super-speed, he can negate the effects of gravity completely and leap off of the ground using his great strength, unfettered by the Earth's gravitational field.

By localizing the gravity-shielding electron flow so it affects only one area of his body, the difference between the weighted and weightless sides would result in motion. For instance, making just the upper half of his body weightless would result in his lower half to "fall" upwards if vertical, or forwards if horizontal. Similarly, making the left side of his body weightless would make him "fall" to the left, and making his right side weightless would cause him to turn right. Thus, he has the ability to fly.

Superboy may sometimes use his ability to negate gravity in a way that can be misinterpreted as super-strength. If his body is a natural gravity shield, then anything he holds above it will be reduced in weight. This might serve to explain how he is able to fly buildings carried by one corner and they don't fall apart.

Superboy's super-breath is as powerful as it is because his super-strong lungs can super-compress air and then release it at super-velocity. He can also freeze the air around objects by either drawing cold air down from the upper atmosphere with his powerful vaccuum breath to release elsewhere, or condensing the moisture in the air into ice.

Superboy having a dense molecular structure means that the lenses of his eyes refract light to a much higher degree. Combined with his body's high-conductivity, which enables him to emit powerful rays of electromagnetic energy, he can see objects far away with telescopic-like vision. This also explains his microscopic vision.

His ability to emit electro-magnetic radiation from the higher wavelengths, such as x-rays, to the lower ones, such as infrared, explains his ability to see through objects, to melt them, and to also see in the dark.

According to Einstein's formula of relativity, E=mc2 - where energy equals the mass of an object multiplied by the speed of light squared - it would be impossible for a physical mass to travel faster than light-speed. As it approached that velocity, its mass would increase exponentially, thus making it harder to move. At the speed of light, both the object's mass and its speed would be infinite.

Superboy gets around this problem by possessing the aforementioned ability to convert energy to body mass, and vice-versa. As his body approaches the speed of light, he transforms the gained mass into energy, which supplies him with the necessary power to propel himself even faster, thus breaking the light-barrier. In this way, he can travel through time and space.

Clothing and objects that are from Krypton, or other heavy gravity worlds orbiting a red sun, also have their molecular structures altered to become super-dense when on Earth.

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Personal Data

Physical Description: Clark has blue eyes, and black hair - parted on the right, with a lock of hair curling over hairline to the left. He is 5' 10" tall and weights 145 lbs. His chest measures 40" around and his waist 30" (Superboy No. 86).

Superboy defends Star BoyPersonality: Superboy is a staunch believer in truth, justice, and honesty; he will always keep his word, even to a villain. He is, however, clever enough to find a way to get around the truth without actually having to tell a lie or go back on his word (Superman No. 147). Superboy has a code against killing, which the Legion adopted as part of their constitution (Superboy No. 147). He does, however, support the right of non-invulnerable people to take life for the purpose of saving life, as in the self-defense trial of Star Boy (Adventure Comics No. 342). This comes from his innate desire to protect people who don't share his invulnerability.

Superboy has a fear of failing people or letting them down. He can create overly imaginative "explanations", often prompted by a need to fulfill some emotional need (Superboy No. 89). He is humble, self-sacrificing, and noble. He is considered by most beings in the known universe as being the greatest super-hero of all time.

Skills: Superboy is mechanically inclined, his greatest invention being his Superboy Robots. Those, and all his super-tools, and all the momentoes he posesses of his homeworld Krypton, he has written in his will to be left to the Legion (Adventure Comics No. 378).

Interests: Superboy likes to play games of strategy with his fellow Legionnaires (Adventure Comics No. 342, 362, 373). He also likes to build things in his spare time, and for Superboy that usually means large scale construction projects, such as buildings or bridges (314).

Previous Occupations: Besides being the most famous super-hero of the 20th century, as Clark Kent he works as a stock boy and cashier in the Kent General Store.

Nicknames: "The Boy of Steel", "Supie" (Adventure Comics No. 372, 380)

Relationships: Mon-El is like a big brother to Superboy, and his best friends in the Legion also include Ultra Boy, Saturn Girl, Brainiac 5 (the "descendant" of his future foe, Brainiac), Shrinking Violet, Karate Kid, Star Boy, Phantom Girl, and Cosmic Boy. Superboy pretty much gets along well with every Legion member.

Superboy has been fairly unromantic where female teammates are concerned, and in as much as he tries to avoid relationships, fate has already decided his future spouse. Of all the girl-Legionnaires, his friend Duo Damsel has been the most infatuated with the Boy of Steel, but her crush is a frustrating one as she has seen the person Superman will marry on history tapes (Adventure Comics No. 369). Superboy's first love was the Atlantean, Leta Lal, who is the ancestor of Lori Lemaris, who, coincidentally enough, was Superman's first love (Adventure Comics No. 333).

Known Relatives: Jor-El and Lara are his biological parents, who died during the destruction of the planet Krypton. On Earth, Jonathan and Martha Kent are his legally adoptive parnets (although they are usually referred to as his "foster parents"). Kara Zor-El / Supergirl is his cousin from the 1960s.

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Membership Record

Application: Superboy was visited by three teens from the future - Cosmic Boy, Saturn Girl and Lightning Boy - and invited him to return to the future with them in their time machine with the intention of being installed as an honorary member of their super-hero club, the Legion of Super-Heroes.

Arriving in the 30th century, Superboy was put through three initiation tests. First, he failed to find the sunken statue of the Unknown Spaceman, losing out to Saturn Girl because he had to stop a runaway Superboy robot. Then he failed to put out a forest fire and lost out to Cosmic Boy because he had to dispose of a falling satellite. Lastly, he failed to warn the Nova Express of its leaking fuel tank, losing out to Lightning Boy because he had to capture an invisible eagle from Neptune that had escaped from the Interplanetary Zoo. As a result, Superboy was rejected from the Legion of Super-Heroes. Despite the jibes, Superboy took it with a smile covering his broken heart.

Superboy is accepted into the Legion of Super-HeroesInduction: Superboy was called back and told that his rejection and tests were part of his initiation. He had failed the three tests bobly ecause the Legionnaires arranged for the distractions, and ecause Superboy proved he was a super-good sport, he was made an honorary member. When an alarm from South Pole City came, Superboy fixed their giant cosmic lamp by using a magnetic meteor to straighten it out. He then used salt to seed the clouds to create heat lightning to keep the citizens of South Pole City warm until the atomic lamp was fixed. Arriving back at the clubhouse, he guessed that Saturn Girl wanted to ask him why he didn't simply use his super-strength to fix the tower. Because he used magnetism, lightning and a mind-reading trick to duplicate their powers, and all on one job, Superboy earned the team's highest award - "Super-Hero Number One" (Adventure Comics No. 247).

Comments: Superboy was made a full-time regular member the following year in mid-2963. According to Adventure Comics No. 323, the leadership election for the 3rd term was on the anniversary of the day Superboy was sworn in as a member. In Saturn Girl's flashback to that day (seen in part 2, page 8, panel 1), Cosmic Boy is the leader performing the ceremony and Lightning Lad is among those members present. This means that Superboy was made a full member on the last day of Cosmic Boy's term, shortly before the election which Saturn Girl telepathically "rigged" in order to battle Zaryan the Conqueror herself (304 - page 2, between panels 4 and 5).

Superboy first met his Kryptonian cousin Supergirl shortly after this, at Lightning Lad's funeral, and following this she had to place a super-hypnotic command into his mind to make him forget about her each time he returned to his own era (Adventure Comics No. 334, 341).

Reserve Status: When the Legion was told they had to limit their team's membership in order to avoid paying back taxes, Superboy went out of his way to do the noble thing and resign, feeling that he wasn't needed as he wasn't as powerful as Mon-El and didn't belong in the 20th century (Action Comics No. 387/2). He was retained as a Reservist, however (Action Comics No. 391 "Metropolis Mailbag").

Positions Held: Former honorary member; deputy leader for 4th and 5th terms (2966-67 and 2967-68, respectively)

Aliases Used: (with the Legion) "Marco Malok" (Adventure Comics No. 372)


Career Highlights:

Adventure Comics No. 310 (July 1963) "The Doom of the Super-Heroes"

After Mask Man killed every Legionnaire but Superboy, the Boy of Steel figured out that the evil dwarf was actually Mxyzptlk V, the descendant of Mr. Mxyzptlk. Superboy tricked the imp into saying his name backwards by completing Brainiac 5 and Saturn Girl's reverser instrument and placing it near the villain. He used it to reverse the lettered moons above the villain into spelling out Mxyzptlk's name backwards, and when the villain saw the effect, and realized that the reverser was the cause of it, he said "Kltpzyxm", thinking the reverser would make it come out forwards, just to spite Superboy. But Superboy burned out the reverser's wiring just before he spoke, and Mxyzptlk was sent back to the 5th dimension and all the effects of his magic vanished, restoring all the Legionnaires to life with no memory of what had happened.

Adventure Comics No. 312 (Sept. 1963) "The Super-Sacrifice of the Legionnaires"

Superboy was one of the six Legionnaires who gathered to risk their lives in order to revive the frozen Lightning Lad using the Daxamite life-exchanging machine. Superboy insisted that they all get a chance to sacrifice themselves, even though he and Mon-El wouldn't actually be killed because of their invulnerability but just put into a death-like coma. Ultimately, it was Proty who substituted himself for Saturn Girl and, using a duralim metal wand to attract the lightning, sacrificed his life essence to restore Lightning Lad.

Adventure Comics No. 320 (May 1964) "The Revenge of the Knave from Krypton"

The super-bully from Krypton, Dev-Em, returned into Superboy's life, but this time as a reformed helper and assistant for the Inter-Stellar Counter-Intelligence Corps (I.C.C.) in the 30th century. When the I.C.C. asked that Superboy take Dev-Em's place in infiltrating the Cosmic Spy League because he had more counterespionage experience, the Boy of Steel wondered if Dev-Em would be mad at him. However, Dev-Em whole-heartedly assisted him by giving him necessary information and even saving him from the League's gold kryptonite by sending Proty II along with Superboy, forewarned and hidden his cape pouch. The protean took the place of the villain's gold kryptonite and Superboy, disguised as Dev-Em, pretended to succumb in order to take the League by disguise, then rounded them up and took them to the I.C.C. headquarters.

Adventure Comics No. 342 (Mar. 1966) "The Legionnaire Who Killed"

When Star Boy was put on trial by the Legion for killing Kenz Nuhor in self-defense, Superboy volunteered to act as his defense attorney, believing that the Legion code should be ammended to permit Legionnaires to take life for the purpose of saving life.

Adventure Comics No. 333 (June 1965) "The War Between Krypton and Earth"

  Superboy and Leta LalThe Legion discovered a millions-of-years old Kryptonian tablet buried inside a rock on Earth. It spoke of a war between Krypton and Earth, so Saturn Girl led a team with Superboy to ancient Krypton and Brainiac 5 led one to the Earth of the past. On Krypton, Superboy met a remote ancestor, Zat-El, who was the leader of a group of scientists who were fleeing persecution from technology-hating Krypton. Assisting them on their voyage to Earth, Superboy discovered that Earth had a red sun in the distant past and so he and his fellow Kryptonians gained no super-powers when they arrived. They met up with Brainiac 5's team, who were helping the Atlantean colonists from Vrunn build their city, and Superboy met and fell in love with Leta Lal, daughter of Jhor Lal, the leader of the Atlanteans. After a war broke out between the two rival colonies, so too the Legion was split, each group taking a side. Superboy was obliged to stand by his Kryptonian friends but after some of them were killed in the fighting, and the Kryptonians vowed to destroy Atlantis, he crossed the battle lines to try to find out if the other team of Legionnaires had actually assisted the Atlanteans in killing - and to spend time with Leta. Eventually, it was revealed that the Atlanteans hadn't meant to kill - their shock-guns were only meant to stun but differing physiologies had rendered their effect fatal to the Kryptonians - the fighting ceased. When it was found that the air of Earth was slowly killing the Atlanteans, Brainiac 5 scientifically adapted the Atlanteans to life as mer-people, Star Boy used his power to sink the colony of Atlantis into the sea, and Superboy said farewell to Leta.

Adventure Comics No. 346/347 (July/Aug. 1966) "One of Us Is a Traitor" / "The Traitor's Triumph"

  Superboy outsmarts the KhundsAfter deputy leader Superboy swore in four new members, he helped organize the UP's defense against the impending Khund invasion. After the first tower was destroyed, he secretly built a dummy electro-tower in South America and hid the real tower underground. After the dummy tower was destroyed, the real electro-tower was revealed to effectively eliminate most of the Khund fleet.

Adventure Comics No. 350/351 (Nov./Dec. 1966) "The Outcast Super-Heroes" / "The Forgotten Legion"

After a cloud of Green Kryptonite attracted itself to Earth's magnetic field and would stay like that for at least two years, Superboy and Supergirl were honorably discharged from the Legion of Super-Heroes, and their memories of the future wiped by the implantation of green-K capsules in their brains. As they left, they named their replacements, Sir Prize and Miss Terious, who were actually Star Boy and Dream Girl on a mission to save the White Witch. Superboy temporarily had his memory of the Legion restored so that he and Mon-El could travel to Master Mxyzptlk's fifth dimension and get from him an ingredient for Miss Terious' magic spell. In the end, Color Kid of the Legion of Substitute Heroes changed the green-K cloud to blue and Superboy and Supergirl rejoined the Legion.

Adventure Comics No. 352/353 (Jan./Feb. 1967) "The Fatal Five" / "The Doomed Legionnaire"

Superboy was one of the five Legionnaires to battle the all-powerful Sun-Eater. He also "recruited" the Emerald Empress, who took a warped liking to the Boy of Steel. Although he was too weak from red sun radiation to carry Tharok's absorbatron bomb into the center of the destructive cloud, Superboy courageously volunteered as he thought he had the best chance of surviving the bomb's effects. However, Ferro Lad took the courageous initiative and slugged the Boy of Steel and detonating the bomb on target himself; he was vaporized in the blast along with the Sun-Eater.

Adventure Comics No. 357 (June 1967) "The Ghost of Ferro Lad"

The Renegade Controller that sent the Sun-Eater to Earth's galaxy returned to hoax the four Legionnaires that survived the attack. Using a fake "ghost of Ferro Lad" he managed to convince the four that they were responsible for their heroic teammate's death. After disbanding the Legion, Superboy was captured by the Controller, who planned to use his mind-influences on the Boy of Steel to put him under his control. However, Ferro Lad's spirit returned to activate Superboy's flight-ring danger signal. When the others arrived, the Controller was about to destroy them all when Ferro Lad's spirit confronted the renegade and caused him to have the alien equivalent of a heart attack, thus balancing the scales of eternal justice.

Adventure Comics No. 365/366 (Feb./Mar. 1968) "Escape of the Fatal Five" / "The Fight For the Championship of Universe"

Superboy was one of the team of members that fought in a last stand in their clubhouse against the Fatal Five. It was Superboy's suggestion to engage in a battle for the key to the UP's defense, having to tussle with Validus, who was a dozen times more powerful than himself. Though the clubhouse was totaled, the Legionnaires managed to hold their own until the UP fleet arrived like the cavalry to chase the Fatal Five away. Superboy and the others were decorated by the President of the UP in gratitude for their courage.

Adventure Comics No. 369/370 (June/July 1968) "Mordru the Merciless" / "The Devil's Jury"

Superboy, Mon-El, Shadow Lass and Duo Damsel fled back to 1930s Smallville to elude the wrath of Mordru the Merciless. Clark Kent covered for his undercover teammates at school, and during the course of events, lost his knowledge of being Superboy only to be reminded of it by Pete Ross and Lana Lang! The Legionnaires fought back and Mordru was eventually defeated by his own rage.

Adventure Comics No. 372 (Sept. 1968) "School for Super-Villains"

Superboy went undercover with three other Legionnaires, posing as expelled Academy trainees in order to bust up Tarik the Mute's School for Super-Villains. As "Marco Malok" Superboy got punched out by Nemesis Kid, but in the end he came up with the plan to switch identities with Chameleon Boy and help win the day.

Adventure Comics No. 378 (Mar. 1969) "Twelve Hours to Live"

When Superboy was poisoned by some rakurga made with a kryptonite base, he first returned to Smallville, but couldn't face his parents and all the memories he had there. He returned to the future to accomplish numerous super-deeds to give the people there something to remember him by, including destroying glaciers that threatened cities near the polar ice-cap, tracking down a space roc that was terrorizing the space lanes, and gathering up a billion dollars worth of space jewels to donate to the Interplanetary United Fund. He and the other Legionnaires were eventually cured by the Seerons (Adventure Comics No. 380).

Superboy gives the people of the 30th century something to remember him by

Action Comics No. 387 (Apr. 1970) "One Hero Too Many"

  Superboy resigns from the LegionAfter the head of Earth's Bureau of Revenue and Taxation told the Legion that had to drop one of their members from their roster, Superboy took it upon himself to ensure that he would be the one to leave the team. He felt that he didn't belong in the 30th century and wasn't really needed anyway, since Mon-El had all of his powers but not all of his weaknesses. Knowing that his resignation wouldn't be accepted outright, he used his x-ray vision to burn all of the other resignations, and faking one for Dream Girl, which she refuted writing because she had seen herself on a Legion mission in the future. When Supergirl tried to quit, Superboy summoned the Super-Pets with his super-ventriloquism and had Streaky and Comet say they would also resign the team if she left, forcing her to stay. He then tried to stop the Legion's computer from picking the least helpful member with his x-ray vision, but its defense mechanism hit him with a green kryptonite bolt. He admitted to sabotaging the proceedings and handed in his resignation, which leader Karate Kid accepted since the Boy of Steel wouldn't justify his actions. The Legionnaires knew he must have had a good reason for what he did, and honored him with a monument carved by Mon-El and turned to gold by Element Lad, hoping he would return someday to see it.
 

For information concerning Superboy's Legion career after 2969, click here.

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