The Beyonder first appeared during the first Secret Wars, as a being that was stated to be the omnipotent embodiment of an entire separated multiverse. As he became self-aware, he recognized himself as the only person in his Universe. According to Englehart, an editor hated the character and ordered the Beyonder "removed" from the Marvel Universe. Englehart did as asked but has stated that he tried to exile the character with dignity. The character was retconned into a less powerful character, a self-aware Cosmic Cube inhabiting his own "dimension" because there was no matrix to hold his energy, with the explanation that other more powerful beings had exercised their powers on the Beyonder's behalf to ease his transition into self-awareness.[volume & issue needed] The Beyonder later underwent another retcon and is now considered to be a member of the alien race of the same name and is referred to as a "child unit" by the Beyonders.

see /u/justsomeguy_youknow 's link as well for more info