Created by Roy Thomas and Neal Adams in a 1973 issue of "Amazing Adventures," Jonathan Raven earned the nickname Killraven as a human gladiator forced to do battle with other humans by the alien race that conquered an alternate Earth. In the Marvel universe, Killraven's adventures occurred on an alternate version of Earth dubbed "Earth-691," and his adventures unfolded in a timeline that stretched from a Martian invasion in the year 2001 through a final gambit in the year 2020.*