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Radioactive Man is a major character from the TV series The Simpsons. He is a fictional superhero who stars in a comic book franchise of the same name.

He is voiced by Harry Shearer.


He appeared for the first time in the episode "Bart the Genius". He is a comic book superhero who acquired his powers after surviving an atomic bomb explosion. His sidekick is Fallout Boy, and his catchphrase is "Up and atom!" He is a member of the the Superior Squad. He also appeared in "The Simpsons: Tapped Out". In one episode, Rainier Wolfcastle was offered the part to play Radioactive Man.

Powers and Abilities

Very few sources to Radioactive Man's actual super powers have been made. As a result, the extent of his powers are not discovered. It can be inferred that Radioactive Man has some level of superhuman strength and invulnerability to injury. In one Simpsons episode, Bart shows Lisa a comic where Radioactive Man is seen throwing a villain into the sun and quipping, 'Hot enough for you?'. In the planned Radioactive Man movie, a stunt was filmed in which he easily lifts a van off Fallout Boy.



  • There is a Marvel Comics villain named Radioactive Man; he is unrelated to the Simpsons character.
  • His archenemy is Dr. Crab, who originally looked like the Captain Marvel villain Dr. Sivana, but then mutated into a humanoid crab. He is very much like most stereotypical mad scientist villains, even speaking in a German accent.


               Simpsons Logo.png Heroes

Simpson Family
Homer Simpson | Marge Simpson | Bart Simpson | Lisa Simpson | Maggie Simpson | Abraham Simpson | Mona Simpson

Major Characters
Ned Flanders | Apu | Moe Szyslak | Krusty the Clown | Chief Wiggum | Seymour Skinner | Edna Flanders | Groundskeeper Willie | Lenny Leonard | Carl Carlson | Barney Gumble | Professor Frink | Comic Book Guy | Waylon Smithers | Dr. Hibbert | Cletus Spuckler | Rev. Lovejoy | Kent Brockman | Milhouse Van Houten | Nelson Muntz | Otto Mann | Martin Prince | Ralph Wiggum | Judge Snyder | The Sea Captain | Gary Chalmers | Sideshow Mel | Scratchy

Minor Characters
Officer Lou | Officer Eddie | Hans Moleman | Kirk Van Houten | Luann Van Houten | Rainier Wolfcastle | Rod Flanders | God | Akira | Lindsey Naegle | Herman Krustofsky | Dr. Nick Riviera | Database | Allison Taylor | Elizabeth Hoover | Troy McClure | Ian (The Very Tall Man) | Kumiko Nakamura | Bumblebee Man | Radioactive Man | Santa's Little Helper | Snowball II | Mr. Teeny | Strangles | Plopper the Pig | Jerry | Waylon Smithers, Sr.

Groups and Organizations
Van Houten Family | UFoHTH