Carl Gilliard

To Charlotte's displeasure, the center starts a class for fathers-to-be; Sam and Naomi struggle to figure where their relationship is going; Addison's status in the dating world makes her uneasy; Cooper begins a secret affair.

Agent Jack Bauer's intense interrogation uncovers both new leads and incriminating evidence, but his tactics have devastating consequences. Meanwhile, problematic President Logan faces more troubling issues.

House recounts the case of a woman who came to the emergency room with an unexplained illness and no memory of her identity.

Sydney and APO attempt to discover whom Gordon Dean is working for and what their end game is. Meanwhile, when the group claiming to have a cure for daughter Nadia continues to play mind games with him, Sloane struggles for control. Mia Maestro and Amy Acker ("Angel") guest star.