"Teri returns home in an effort to jog her memory; Mason and Jack investigate a lead obtained by Palmer; Dan's brother takes matters into his own hands after learning of Dan's death." With Zeljko Ivanek, Penny Johnson Jerald, Daniel Bess, Vicellous Shannon, Carlos Bernard, Henri Lubatti, Xander Berkeley, Edoardo Ballerini, Kirk Baltz, Navi Rawat, Vincent Angell, Zach Grenier, Megalyn Echikunwoke, Lew Dauber, Mariah Pasos.

"Dennis Hopper joins the series for the season's remaining five episodes as the mastermind behind the conspiracy. His identity and motives for seeking vengeance against the Bauer and Palmer families are revealed during this taut episode, in which Jack continues searching for clues to why the Drazens had planned to cut the power in an apparently deserted area. Lou Diamond Phillips plays a man named DeSalvo who has some answers. Meanwhile, Mason heads back to interrogate Alexis Drazen; Rick tells Kim what to tell the cops; and the country responds to the press conference in which David Palmer talked about Keith." With Penny Johnson Jerald, Tanya Wright, Carlos Bernard, Rick Garcia, Megalyn Echikunwoke, Zeljko Ivanek, Daniel Bess, Xander Berkeley, Navi Rawat, Vincent Angell, Christian Hastings, Jude Ciccolella, Melanee Murray, Darin Heames, Jenn McCullough.