Fox’s X-Men pilot is bringing on a Whedon regular. Amy Acker—of Dollhouse and Angel fame—is joining the show being written by Matt Nix and directed by Bryan Singer, according to The Hollywood Reporter. Together with Stephen Moyer, she’ll round out the central couple. THR reports their characters are separated and Acker’s Kate Stewart is “struggling” with that and “her increasingly challenging teenage children;” we assume that “challenging” in this case means “super-powered.”