2703-2704. Wonder Man and Giant Man

Simon Williams is the son of rich industrialist Sanford Williams, owner of Williams Innovations. Simon inherits the munitions factory after his father's death, but the company's profits fall due to its biggest competitor, Tony Stark. On the advice of his brother Eric, Simon tries to embezzle funds from his company but is caught and incarcerated. Simon blames Stark for this and accepts the proposition of master villain Baron Heinrich Zemo after the Enchantress pays his bail, as a pawn is required to infiltrate the Avengers. The desperate Simon Williams agrees and is transformed into an ion-powered being with superhuman powers. His powers are tested, and he is shown to have great superhuman strength and durability, even defeating the Executioner. Called Wonder Man by Zemo, he is then sent to meet and join the Avengers, with instructions to betray them at a critical moment so that Zemo's Masters of Evil can destroy the Avengers. Zemo ensures Wonder Man's loyalty by advising him that as a result of the treatment his body now requires periodic doses of a serum to survive — a serum that only Zemo can provide.
The Avengers were lured into a trap and captured. The plan fails when Wonder Man decides to save the Avengers and aid them against Zemo, apparently at the cost of his own life. Iron Man (Tony Stark) records Wonder Man's brain patterns in the hope that one day he can be revived. Unbeknown to the Avengers, Wonder Man's body has simply entered a catatonic state as it adjusts to the effects of the treatment.[volume & issue needed] Eric Williams becomes distraught over the apparent death of his sibling and, blaming the Avengers, assumes the identity of the Grim Reaper in an effort to destroy them. The Grim Reaper steals Simon's body at one point, and attacks the Avengers three times before Wonder Man finally returns.
Wonder Man remains in suspended animation for years, and it is during this period that Ultron, the evil robot creation of Henry Pym, steals the brain patterns recorded by the Avengers for use as a template for the synthezoid Vision). It is later revealed that Vision is built from the original Human Torch, an android created by Professor Phineas Horton. This, however, only happened in mainstream continuity and other origins were possible courtesy of the Forever Crystal of Immortus.
During this vulnerable time, Wonder Man is used as a pawn on three occasions. Wonder Man is briefly revived by Kang the Conqueror to battle the Avengers as part of his Legion of the Unliving, and later "resurrected" as a zombie by Black Talon and the Grim Reaper to attack the Avengers once more. On the final occasion, the Living Laser hypnotizes a now-awake but still very weak Wonder Man, in an unsuccessful attack on the Avengers. After this encounter, Wonder Man was restored to true life and chooses to remain with the Avengers, aiding them against Attuma and Doctor Doom. He also fought the Vision, and helped the Avengers battle Graviton. He soon after defeats the Grim Reaper, who was intent on destroying the Vision as he was "artificial" and a "mockery" of his brother; Wonder Man at this point is revealed to have become a being of ionic energy.