History
At some point during his life, Magneto left Earth to travel through space. When he returned, Magneto united all the splintered mutant groups in order to oppose and destroy the Sentinels. Magneto also managed to recruit non-mutant heroes such as the Avengers, Fantastic Four, and Spider-Man who had sought refuge on the Moon. Magneto sent the non-mutant heroes on a suicide mission in order to shock people into distrusting the Sentinels and their masters. Magneto continued to lead the mutants for a time until his execution.[1]