After infiltrating Xavier's school in the guise of the mutant healer Xorn, a Magneto imposter adopted the Institute's special class of students - Basilisk, Ernst, Martha Johansson, Beak, and Angel - as his Brotherhood. Joined by Toad and Esme of the Stepford Cuckoos, the faux Magneto attempted a hostile takeover of Manhattan. However, his inability to control the resulting chaos resulted in the fracturing of the Brotherhood after he inadvertently killed Basilisk and was himself decapitated by Wolverine.
Brotherhood of Mutants I:
Magneto
Toad
Esme Cuckoo
Angel
Beak
Basilisk
Ernst
Martha Johansson