Radioactive Man is the name of two characters from Marvel Comics.
A nuclear physicist and Communist agent in the People's Republic of China, Chen Lu first appears in Journey into Mystery. Ordered to find a way to defeat the Thunder God Thor - who thwarts the Red Army's invasion of India - the character exposes himself to small doses of radiation until he is able to endure a massive barrage, becoming a living "Radioactive Man."
Traveling to New York City, Chen finds and battles Thor, who defeats the villain by creating a vortex and transporting the character back to China.
The character becomes a recurring foe in Avengers, being found and coerced by Baron Heinrich Zemo to join the original Masters of Evil in a failed bid to destroy the Avengers. The character reappears as part of the second incarnation of the Masters of Evil, with this version formed by the robot Ultron. The villains, however, are betrayed by the Black Knight. The Radioactive Man and his teammates appear once again during a Halloween parade and are defeated by a loose coalition of superheroines called the Lady Liberators.
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Official Site: Marvel Comics
Links: Dr. Chen's Wiki Page Dr. Chen's Marvel Database Dr. Chen's Marvel Biography