Wonder Man

Wonder Man (Simon Williams) is a fictional character. He appears in American comic books published by Marvel Comics. It was created by writer Stan Lee and artists Don Heck and Jack Kirby. He first appeared in "The Avengers" #9 (October 1964). 
The character, who was introduced as a supervillain with "ionic" energy, fought the Avengers. After a series of events, he was reborn as a superhero joining the team against which he originally fought.