Later, although not a mutant, she joined the Marauders, a group of mutants working as assassins for the enigmatic geneticist known as Mister Sinister. Sinister wanted his assassins to destroy a large community of mutants, known as the Morlocks, who lived under New York City, as he had deemed them genetically useless. The Marauders did succeed in annihilating a large number of the underground mutants. While the Marauders were accomplishing this, they also clashed with the X-Men, X-Factor, Thor, and Power Pack. With the Marauders, she also attempted to kill Madelyne Pryor.