Sam took on the alias Cannonball and became a member of the EMF alongside his sister , Elisabeth , a.k.a.
They were approached by Mister Sinister , who offered them the chance to become part of his Elite Mutant Force .
Sam took on the alias Cannonball and became a member of the Elite Mutant Force alongside his sister , Elisabeth , a.k.a.
They were approached by Mister Sinister , who offered them the chance to become part of his Elite Mutant Force .