Steel (John Henry Irons) the comic book tie-in of "Justice League Unlimited". Steel (John Henry Irons) Steel (John Henry Irons) also known as the Man of Steel is a fictional comic book superhero in DC Comics. Introduced in 1993 as one of several replacement characters for the then-deceased Superman, Steel continued to be an independent superhero after Superman's resurrection. He received his own ongoing series which saw him move from Metropolis to Washington, D.C. and join the Justice League of America in Grant Morrison's "JLA". He later mentored his niece Natasha Irons who became a superheroine herself. First appearing in "The Adventures of Superman"
Machine Man Machine Man Machine Man (also known as Aaron Stack, Mister Machine, and serial number Z2P45-9-X-51 or X-51 for short) is a fictional character, an android superhero appearing in American comic books published by Marvel Comics. The character was created by Jack Kirby for "" #8 (July 1977), a comic written and drawn by Kirby featuring concepts based on the eponymous Stanley Kubrick and Arthur C. Clarke . Shortly thereafter, Machine Man spun off into his own Kirby-created series. He is a robot, the only survivor of a series, raised as a human son of scientist Abel Stack, who was killed