S2·E26 The Charm Offensive

While hanging out at Fort Knox, Gwen grows jealous of Ben's aliens getting all the glamour and attention. But when she discovers that a new villainess, Charmcaster, is really Michael Morningstar's last remaining fangirl turned witch (from the end tag in season 1), Gwen must withstand attacks from both her and Morningstar, and prove herself as a valued member of Team Tennyson.