Synopsis

Finding an unexpected ally in Brother Sam, Dexter grapples with the possibility of a flicker of good within himself, a counterpoint to the shadows that define him. The hunt for the Doomsday Killers leads him down unfamiliar paths. Meanwhile, Batista and Quinn visit the university where Professor Gellar once taught; the aftermath of the shooting necessitates Debra's return to therapy, a requirement of departmental policy.