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Amy tries to help Sheldon get over his compulsive need for closure when one of his favorite TV shows is canceled; Raj discovers a secret about Lucy.

Leonard and Sheldon hire the host (Bob Newhart) of their favorite childhood TV show to perform; Bernadette and Howard run into trouble while dog-sitting for Raj's pet.

Amy and Sheldon's relationship takes a surprising turn during a game of "Dungeons & Dragons"; Lucy and Koothrappali have an awkward date.

When Leonard receives an exciting opportunity to work overseas, Penny and Sheldon are thrown for a loop.

Sheldon and Penny share secrets while Leonard is away; Wolowitz helps Raj get over his ex.

Leonard and Sheldon's friendship is tested; Wolowitz's relationship with his mom causes a threat to his masculinity.

Raj designs a scavenger hunt that brings out the best -- and the worst -- in the whole gang.

Cady Heron enrolls at North Shore High School near Chicago after living in Africa. She interacts with Regina George, a prominent student who previously dated Aaron Samuels. Conflict arises when Heron develops an interest in Samuels, leading George to feign a friendship with Heron while attempting to maintain her relationship with Samuels. Both students engage in competitive social behavior that affects the student body.