Countdown is the 20th episode of Season 2 of Alias and the 42nd episode overall. A Rambaldi manuscript prophesizes that an apocalyptic event involving a heart will soon take place. An agent is sent after one man in Panama in order to steal his heart. Dixon's grief leads Vaughn and agency psychologist Dr. Barnett to question his intentions, as his thirst for revenge on Sloane intensifies. Meanwhile Sloane receives a life-changing revelation from a mysterious monk in Nepal, and Sydney and Dixon hunt for the killer who stole the heart from his victim.