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"
Known Space Known Space Known Space is the fictional setting of about a dozen science fiction novels and several collections of short stories written by Larry Niven. It has also become a shared universe in the spin-off "Man-Kzin Wars" anthologies. ISFDB catalogs all works set in the fictional universe that includes Known Space under the series name Tales of Known Space, which was the title of a 1975 collection of Niven's short stories. The first-published work in the series, which was Niven's first published piece was "The Coldest Place", in the December 1964 issue of "If" magazine, edited by Frederik Pohl. This