"The Big One" is the fifth season finale of the American television drama series Dexter, and the 60th overall episode of the show. It originally aired on Showtime on December 12, 2010. In the episode, Dexter attempts to save Lumen from Jordan Chase, as his sister, Debra, comes closer to uncovering the truth in her investigation. Meanwhile, Quinn falls under suspicion for Dexter's murder of Stan Liddy.