 However, Mister Atom was re-introduced in 1976, by which time DC Comics had purchased the rights to use the Captain Marvel characters; Captain Marvel's enemy King Kull used his advanced scientific acumen to bring Atom back to the 20th century and employed his help battling Shazam's Squadron of Justice.Atom's first appearance in a DC comic was in "Justice League of America" #137, a crossover issue depicting Captain Marvel's first meeting with Superman.With Brainiac projecting a force field around him a much larger Mr Atom attempts to wreck a futuristic city on Earth-One called Tomorrow.