Malice

The psionic entity Malice was recruited by Mister Sinister to join his Marauders. As a member of that organization, Malice body hopped through a number of female X-Men, including Dazzler, Rogue and Storm. But Storm's will was too strong, and she forcibly ejected Malice from her body. During the Marauders attack on Polaris, Malice possessed the powerful mutant. As their two energy matrices interwove, the two women became permanently bound together. Mr. Sinister had known this union would occur, but failed to warn Malice of it because he had specific plans for the now-blended entity: using the Malice-possessed Polaris to attack the X-Men, who counted among their team members Polaris' lover Havok.