"Chuck Versus the Tooth" is the 16th episode of Chuck‍‍ '​‍s third season, and originally aired on May 10, 2010. When Chuck struggles with disturbing dreams, he believes his most recent one predicts danger for a visiting head of state. Beckman, however, is unconvinced and assigns Chuck to meet with a CIA psychiatrist Dr. Leo Dreyfus (Christopher Lloyd). Meanwhile, Ellie gets surprising news and Anna (Julia Ling) returns to the Buy More to talk to Morgan.