Mister Atom
Mister Atom is a fictional supervillain appearing in American comic books published by DC Comics. The character is an evil radioactive robot and an enemy to Captain Marvel. The mad scientist Charles Langley created him to go on a destructive rampage, which he is very very good at doing. He has been a member of the Monster Society of Evil and the Secret Society of Super-Villains.
Mister Atom was created by Otto Binder and C. C. Beck, first published by Fawcett Comics in Captain Marvel Adventures #78. (1947)