"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.
Chuck and Sarah are relaxing at home watching TV when Chuck dozes off and experiences a disturbing and surreal dream, which he interprets as indicating the president Jakaya Kuti of Zamibia (Lawrence Hilton-Jacobs) is the target of an assassination plot by the Ring. Beckman, however, is unconvinced, so she orders Chuck to undergo evaluation by a CIA psychiatrist. Chuck meets with Dr. Leo Dreyfus, who reveals the government believes in the possibility of harmful side-effects caused by the Intersect which may now be affecting Chuck. Despite Chuck's insistence on the existence of a legitimate threat to Kuti, Dreyfus recommends Chuck be removed from active duty status. Chuck, however, remains convinced of a plot. He does not tell Sarah about Dr. Dreyfus's diagnosis, and taps Morgan for an unauthorized mission to the Beethoven concert where he believes the assassination attempt will take place.