Born in the early 1900s to a noble Prussian family who had relocated to Strucker Castle in Bavaria following the Franco-Prussian War, Wolfgang von Strucker became a Heidelberg fencing champion. In World War II he served as lieutenant to Hydra's Super Soldier, the Red Skull.
Over the years, Strucker has climbed far up the ranks of Hydra, even taking control of the organization and claiming the title of Baron when Zemo was imprisoned by S.H.I.E.L.D.
During one of Hydra's missions to acquire lost relics of the occult, Strucker came into possession of a gauntlet of immense power. Although it cost Strucker his right arm, the gauntlet has given him the ability to sap another person's life force, absorbing it into himself and thereby keeping himself young and strong.
Eric was the black sheep of his family: he was just born bad. He was a vandal and bully in school, and graduated into petty crime. As he got older, he got bolder... joining the MAGGIA, an organized crime syndicate.
But when petty crime didn't satisfy his destructive urges, he moved on and learned about HYDRA. Hydra saw the potential in Eric and outfitted him with a CYBERNETIC ARM which could turn into a power-scythe. He took the name ‘Grim Reaper', and is now a high ranking Hydra officer.
Eric Williams is a bad person. He likes to hurt people – he's sadistic. His brother Simon was the smarter of the two, but Eric had the stronger personality. A mean, horrible personality.
Menial laborer Sam Sterns was working as a janitor in the lab where Bruce Banner was working on a gamma project, and it was there that Sterns was exposed to gamma radiation. And while weak but brilliant scientist Banner was transformed into the Hulk, the low-functioning Sterns was transformed into a superhuman GENIUS.
He possesses enhanced intuition, pattern solving, information storage and retrieval, and logical and philosophical structuring. His ability to predict probable outcomes of tactical and strategic scenarios is so advanced that it borders on clairvoyance. The Leader has a perfect memory with the ability to recall every moment since the accident that gave him his powers.
The Leader possesses knowledge of genetics, physics, and robotics, and has designed a large number of sophisticated weapons, vehicles, computers, androids, and synthetic humanoids. He is particularly adept at genetic engineering and manipulating radiation for various nefarious purposes.
And given how brilliant he is, the Leader could come to only one conclusion... He should rule the world.
Formerly a scholar, Nathaniel Richards reinvented himself as Kang the Conqueror. Now, he comes from the FUTURE, back in time to save the world - by conquering it.
He's got armies of robots, armadas of ships, all of it from the far flung future and more advanced and powerful than anything we can imagine.
And if the Avengers beat him, he'll just come back in time and try it again.
Was created by the Avengers themselves, and although they don't know it yet, they've brought a mechanical doom to the planet.
Long ago, Hank Pym and Tony Stark worked together to create a new robotic AI, one with human brain waves mapped onto a computer. But when Hank found out that Tony intended to sell it as a weapon, he scuttled the project.
Now, in a time of need, Hank brings Ultron back online. Ultron was programmed to protect humanity, but its artificial intelligence is so advanced, it finds the only logical solution to save humanity...is to control it.
Humanity must be saved from itself, and if the humans will not submit...they must be destroyed.
Loki is Thor's half-brother and the Norse God of Mischief. He has a grudge against his brother, the favored son of Odin, and plans to do both Thor and Asgard harm.
And since 'Earth' and humanity is so loved by Thor, they're certain to feel Loki's wrath as well.
Like all Asgardians, Loki seems to have super strength and durability. He's also a very capable WIZARD, able to cast spells of incredible power.
Dr. Heinrich Zemo was the head of Hydra's bio-weapons division during World War II, responsible for the imperfect Hydra serum that created the Red Skull and which has also allowed Zemo to survive over the years. Genetic enhancement, breeding programs, viruses… Zemo had his hand in all of it.
Over the years, he took control of Hydra and ruled it with an iron fist, continuing his projects and working toward world domination. He's brilliant, a strong leader of men and has an indomitable will. And he's evil.
Zemo is a sadist and likes to try out his serums, genetic tests and weapons on people first (entire TOWNS in some cases). His vile acts were infamous during World War II and he used to have to wear a mask to conceal his identity and avoid retribution. During a fight with Captain America however, one of his experiments backfired and his mask became permanently grafted to his face.
Weapons maker, geneticist, soldier… he's the anti-Iron Man, Ant-Man and Captain America all rolled into one.
Formerly known as Emil Blonsky, a special forces operative trained by the British SAS, the Abomination gained his powers after receiving a dose of gamma radiation similar to that which transformed Bruce Banner into the Incredible Hulk. As a result he was permanently transformed into a massive green-skinned monster whose physical power was equivalent to, if not greater than, that of the Hulk. While he was able to maintain his normal level of self-control and intelligence after this transformation, he is unable to return to human form.
Given his gamma-spawned origins, Blonsky blames his condition on Banner and his alter ego, the Hulk.