Real name: Dr. Henry "Hank" Pym
Occupation: Adventurer, Biochemist, former manager of Avengers Compound
Identity: Publicly known
Legal status: Citizen of the United States who received a conviction for treason that was later overturned.
Former Aliases: Ant-Man (I), Giant-Man (I), Goliath (I), Yellowjacket (I)
Place of birth: Elmsford, New York
Marital status: Widower, later remarried and divorced
Known relatives: Maria Trovaya (first wife, deceased), Janet Van Dyne (second wife, divorced)
Base of operations: Avengers Mansion, New York City, New York, (formerly)Avengers Compound, Los Angeles, California
First appearance: (as Pym) TALES TO ASTONISH #27, (as Ant-Man) TALES TO ASTONISH #35, (as Giant-Man) TALES TO ASTONISH #49, (as Goliath) AVENGERS #28, (as Yellowjacket) AVENGERS #59

History: Dr. Henry Pym, an American biochemist with extensive knowledge in other scientific fields, married Marie Trovaya, a brave and beautiful young woman who had been a political dissident in her native Hungary, from which she had fled. Naively believing that his American citizenship would protect her, Henry and Maria Pym traveled to Hungary shortly after their marriage. The Pyms were confronted by agents of the secret police there. Henry Pym was knocked unconscious and Maria was murdered. Pym was greatly distraught by his wife's death, and decided to do whatever he could in the future to battle injustice and inhumanity.

Back in the United States, Pym discovered a rare group of subatomic particles, which have become known as the "Pym particles." Pym was able, though the application of magnetic fields, to entrap the particles within two separate serums. One serum would reduce the size of persons and objects, and the other would restore them to their normal size. Pym tested the reducing serum on himself and discovered it was more powerful than he had expected: it reduced him to the size of an insect. Pym became entrapped in an anthill and was pursued by the ants within. He escaped and restored himself to his normal size with his other serum. Deciding that the serums were too dangerous to exist, Pym destroyed both of them. However, weeks later he reconsidered his decision and began to recreate the serums, whose existence he then kept secret. Inspired by his experience in the anthill, Pym undertook a study of ants, and theorized that ants communicate through psionic / electrical waves transmitted through their antennae. After months of work, Pym succeeded in creating his first "cybernetic helmet," which would enable him to communicate with ants through transmitting and receiving psionic / electrical waves. Thinking that someday he might want to use the shrinking potion on himself again, Pym also designed a protective costume for himself. That same day, however, Pym received an assignment from the government to concoct a gas that would provide people with temporary, limited immunity to radioactivity under certain specific circumstances, based on his previous work. The government also assigned four other scientists to assist him in the project. The K.G.B., the Soviet Intelligence agency, learned of Pym's project and sent agents who held Pym and his assistants prisoner in their own laboratory. Only Pym knew the entire formula for the gas they had by now developed, and he refused to tell the Soviet agents. The agents set about searching the laboratory for the formula, intending to kill Pym and his assistants afterwards. Unseen, Pym donned the cybernetic helmet and protective costume and, using his reducing formula, shrank himself to the size of an ant. He escaped to an anthill outside, put a large number of ants under his control through the helmet, and used them to attack, the agents and free his men, who then overpowered their assailants. Pym then restored himself to normal size. Afterwards, in the guise of the Ant-Man, Pym battled various menaces, including the criminal scientist Elihas "Egghead" Starr, who was to become Pym's greatest enemy.

After an alien being from the planet Kosmos killed the scientist Vernon van Dyne, Pym revealed his secret identity of Ant-Man to van Dyne's daughter Janet, who wished to avenge his death. Pym taught Janet how to use the gas within which he now contained the "Pym particles," and which he used to shrink himself in size, and through bioengineering, gave her the ability grow insect-like wings when she used the gas to shrink herself to insect size. As the Wasp, Janet van Dyne assisted the Ant-Man in finding and defeating the murderous Kosmosian. Pym and van Dyne gradually fell in love; van Dyne reminded Pym of his deceased first wife, Maria. Pym and van Dyne became crime-fighting partners in their costumed identities, and were two of the founding members of the Avengers.

Pym next developed a series of capsules containing the Pym particles which he and van Dyne used to grow or shrink to various heights, he also developed capsules that enabled him to grow to greater than normal heights. Thereafter, Pym preferred to use his power to grow to giant size for crimefighting, and called himself Giant-Man. At first he found that he could not support his own weight if he grew to a height above twelve feet. Later, he was able to reach far greater heights, even 100 feet, and still move about comfortably, but he became weaker in proportion to the amount he grew beyond twelve feet.

However, his size-changing imposed great strains on Pym's body that he believed could be fatal, and, upon deciding that their careers as Giant-Man and the Wasp were proving too great a danger for van Dyne. Pym decided to retire as a costumed crimefighter. Acceding to his wishes, van Dyne retired as a crimetighter, too. Sometime later, however, Pym and van Dyne learned that the Sub-Manner was heading for New York City. Fearing trouble, they decided to alert the Avengers, van Dyne, as the Wasp, was captured by first the undersea barbarian leader Attuma and then by the Collector. In order to help the Avengers rescue van Dyne, Pym decided to use his growing power again, he donned a new costume and adapted the new name of Goliath. By this time both Pym and van Dyne could change size simply by willing themselves to do so, due to their exposure to Pym particles over the years. However, Pym could only achieve one height other than his own, that of 25 feet, and could only do so for exactly 15 minutes. In the course of the Avengers' battle against the Collector, Goliath overstayed this time limit, and, on trying to regain his normal size, could not shrink beneath ten feet.

Eventually Pym regained his ability to shrink to insect size, but lost his ability to grow to ten feet in height. The Collector later subjected Pym to treatments that enabled him to grow to 25 feet in height for up to 15 minutes.

Around this time Pym experimental with robotics and created a robot with the potential for high intelligence. The robot turned against its creator and escaped from Pym's laboratory. It later became one of the Avengers' greatest adversaries under the name of Ultron.

For several years, Pym had been in love with Janet van Dyne, but because of his repressed personality, resisted marrying her. One day while working in his laboratory, Pym accidentally dropped and smashed some vials containing various unknown gases. The released gases wreaked a radical temporary personality change in Pym. He took the new identity of Yellowjacket, claimed that he had murdered Henry Pym, kidnapped, van Dyne, and proposed marriage to her, as Pym had long wanted to do. Realizing that Yellowjacket was really Pym, Van Dyne decided to play along, fearing that she would worsen his psychological condition if she did otherwise. Van Dyne and Pym, as Yellowjacket were married at Avengers Mansion, but immediately afterwards, the Avengers were attacked by the Ringmaster and his Circus of Crime. The shock of seeing van Dyne in danger of death shocked Pym back into his normal personality. The Avengers defeated the Ringmaster and company. Despite the fact that Pym was married under an assumed name, the marriage between Pym and van Dyne was still legal, and Pym and Van Dyne happily agreed to let it stand. Pym eventually renounced his power to became a giant due to its continuing physical strains, and used the name and costume of Yellowjacket in Crimefighting, Pym spent periods of time with the Avengers, and even, once, with the Defenders, as Yellowjacket, but he spent most of his time completely devoted to his scientific research. He gave his blessing to Scott Lang when Lang used his old equipment to become the second Ant-Man.

Scientific research had always been Pym's preferred career, and he no longer found the excitement in crimefighting that he had earlier in his career. Pym began to have periods of tension and depression. He began to feel that he had never made a scientific discovery equal to his discovery of the Pym particles in the several years following that event. Moreover, he was plagued by guilt over creating Ultron. As a result, he was overcome with a sense that he was a failure as a scientist, judged by his own impossibly high standards. This sense of failure was exacerbated when he considered his wife's success as a fashion designer and realized that, as a millionaire, she was the principal source of money in their marriage. Pym began to take out his frustrations through verbally abusing his wife.

Matters came to a head when the Avengers battled the so-called Elfqueen. Suspecting that the Elfqueen was not acting from evil motives, Captain America attempted to calm her down. Yellowjacket, however, who was edgy because of his personal matters, blasted Elfqueen from behind without stopping to consider what Captain America was trying to do. As a result Elfqueen resumed fighting. Afterwards, Captain America felt forced to bring charges against Yellowjacket of acting recklessly, since innocent people could have been killed in the battle that Yellowjacket's action had started again. An Avengers court martial meeting was set to examine the charges. Now beginning to undergo a nervous breakdown, Pym built a robot to attack the Avenger during the court martial. Pym designed the robot to have a secret weak point which he would use to defeat it. Pym fantasized that his defeat of the robot would make him a hero in the Avengers' eyes and lead to the dismissal of the charges. When his wife protested his plan, he brutally struck her. But Pym's plan went awry, and it was the Wasp who ended up defeating the robot. Pym was expelled from the Avengers. Moreover, his wife Janet initiated proceedings that ended in their divorce.

Pym moved out of his wife's mansion. Astonishingly, Pym was now virtually penniless, since his books were out of print and he had somehow exhausted the money he had earned from his patents. Pym lived his life aimlessly until he was approached by his old enemy Egghead. Egghead claimed that he felt guilty over causing his niece, Patricia Starr, to lose her arm, and asked Pym to give her a bionic arm he had designed and attach it to her, in exchange for a large sum of money. Needing the money, Pym fulfilled his assignment, but found that the bionic arm placed "Trish" Starr under Egghead's control. Egghead informed Pym that the bionic arm was booby-trapped and that he could detonate it, killing Trish unless he obeyed his orders. As a result, Pym was forced to help steal adamantium from the government and to fight the Avengers, who defeated him. However, Egghead had lied: the arm was not booby-trapped. Moreover, Trish Starr had been "programmed" by her uncle's technology to claim that it was Pym's plot, not Egghead's. Hence Pym had no evidence that he had stolen the adamantium under duress, and so he was imprisoned on charges of treason.

During Pym's trial, he was captured by the third group calling itself the Masters of Evil, who claimed to be "rescuing" him. Actually, they worked for Egghead, who, having successfully framed Pym, now asked him to join their criminal organization. Pym pretended to agree, and Egghead set him to work on developing a machine intended to lengthen the human life span. Soon afterwards, Pym announced it was finished. Suspecting a trick, Egghead and his allies had Pym hooked up the machine, just as Pym had secretly intended Pym had actually constructed various means of defeating his enemies into the machine, and now turned it against Egghead and the Masters of Evil and single handedly defeated them. Meanwhile, the Avengers had found Egghead's hideout. The Avenger Hawkeye sneaked into the hideout and saw Egghead aiming a gun at the unsuspecting Pym. Hawkeye fired an arrow into the gun barrel. The gun proved to be an energy blaster and backfired, killing Egghead.

Some of the Masters of Evil testified in Pym's trial as to how Egghead had framed him, and Pym was found not guilty. Upon his release Pym decided to give up being a costumed adventurer and returned permanently to a life of scientific research. However, as time passed. Pym decided he wished to add the Avengers without returning himself to life as an adventurer. Hence, he offered to become manager of Avengers Compound, the headquarters of the West Coast Avengers, in which role he would perform many of the same functions that Edwin Jarvis fulfills at New York City's Avengers Mansion. Pym's offer was accepted, and today he serves not only as Avengers Compound manager but as a trusted advisor to the West Coast Avengers.

Pym was on hand with the other Avengers who seemingly sacrificed their lives to absorb the energies of the being known as Onslaught. In reality, he was shunted to another dimension. When he and the other heroes were restored to Earth, Pym found that he was capable of his full range of size-changing abilities, although he could not shrink and grow other objects unless he specifically treated them in his laboratory. He and the Wasp also returned to their previous romantic relationship.

Pym helped re-form the Avengers with the other restored heroes, stopping the menace of the sorceress Morgan Le Fey. He then agreed to stay on as a reserve member, returning to his laboratory work full-time. During this time, his research was monitored by Ultron, who later kidnapped Pym and other of its so-called "family." Ultron revealed that Pym had used his own brain patterns as a template for Ultron's intelligence, and Ultron intended to do the same with all members of its "family" when building a new robot army with Pym's latest research. Ultron was confronted by the Avengers, who freed Pym and allowed him to deliver the blow that defeated Ultron.

Height: 6 ft.
Weight: 185 lbs.
Eyes: Blue
Hair: Blond

Strength level: As Yellowjacket and Ant-Man he had the normal human strength of a man of his age, height, and build who engages in intensive regular exercise. He retained this level of strength even when, as Ant-Man or Yellowjacket, he shrank to insect-size. At giant size as Giant-Man or Goliath, Pym's strength varied according to the height he achieved: at 10 feet tall, Pym could lift (press) 1000 pounds, at 25 feet tall he could lift (press) 10 tons, and at 100 feet tall, Pym could lift (press) 50 tons. The higher Pym grew past 25 feet, the more of his strength he had to use simply to support his own enormous mass.

Known superhuman powers: As Ant-Man and Yellowjacket, Henry Pym possessed the power to reduce himself to the size of an ant, approximately one-half inch in height, by means of the subatomic particles known as the Pym Particles. The nature, source, and mechanics of the Pym Particles remain unrevealed. Originally, when Pym inhaled a gas or drank a potion containing the Pym Particles, the Particles would interact with the electrical impulses of his brain, creating an organism-wide "reducing field." Thus activated, the field reduced his entire body at a uniform rate to the smaller size he desired. Although he usually chose to reduce himself to one half inch in height, he could reduce his size to any size between that and his normal size. Usually, Pym did not compress his mass into his smaller size. Instead his mass was, somehow extended into an extra physical dimension that is opened by the activating of the Pym Particles, from which the mass could later be reclaimed.

To return to normal size, Pym inhaled another gas or drank another potion, either of which contained another type of Pym Particles. These particles interacted with his brain to create an organism-wide "enlarging field," which is energized by mental command. Thus Pym could grow back to his normal height and reclaim all of the mass that was extended extradimensionally.

Strangely, because Pym's mass was extended extradimensionally when he was at ant-size, he retained his full human-size strength at that size, although his weight was reduced in proportion to his insect-like size.

Pym sometimes used the Pym Particles to shrink to sub-microscopic stature. When 99.99 + % of his mass was extradimensionally shunted, he was sent into a "subatomic universe" or "microverse," one of countless alternate universes accessible to Earth only by the mass-shunting process.

Pym also discovered Pym Particles which interacted with his brain to enable him to grow to gigantic height as Giant-Man and Goliath. The growth process required the rapid acquisition of bodily mass, presumably from an extradimensional source. This extradimensional mass fortified all of his cellular tissue, including his bones and muscles, enabling him to support his increased weight, and giving him superhuman strength.

Continuous exposure to Pym Particles over an extended period of time enabled Pym to generate his reducing and expanding fields spontaneously, without exposure to a new quantity of Pym Particles. Hence, Pym could increase or decrease his size simply by will power.

Growth to gigantic size imposed great strains on Pym's body over the years, however, leading to the limitations on his growth abilities described under History.

It is unclear whether or not Pym still retains his superhuman powers. Possibly he has tost them since he has not used them in so long.

Abilities: Dr. Henry Pym is one of the world's foremost biochemists and also possesses considerable expertise in subatomic physics and robotics.

Paraphernalia: As Ant-Man Pym wore a "cybernetic helmet" which permitted him to achieve rudimentary telepathic communication with ants and other higher insects and to control their minds. As Yellowjacket Pym carried miniaturized versions of the helmet's devices in his cowl, enabling him to perform the same feats.

As Yellowjacket Pym carried electric "stingers'' in his gloves which emitted electrical bolts of variable current. His costume also had artificial wings which enabled him to fly.

As Goliath, Pym can shrink an entire laboratory or an array of firearms to the size a microchip when not in use. The various compartments on his uniform straps contain a wide variety of miniaturized equipment.