Real Name: Michael Korvac

Michael Korvac was kidnapped by the Kree for experimental purposes.  Their experimentation gave Korvac the ability to manifest and use a great deal of cosmic energy, but also drove Korvac mad.  In his madness, he destroyed the Kree starship, a planet, a space station, and presumably other things.  He was pursued by the Guardians of the Galaxy to Earth, where Korvac sought refuge.   Fighting both the Avengers and the Guardians of the Galaxy, he left Earth in self-exile after being rejected by his human girlfriend, Corinna.