Sheldon hires Stuart to spend the day with Amy when he'd rather go to a movie screening. Also, Leonard's mother, Beverly, comes to town and Penny struggles to make a connection with her.
Sheldon visits CalTech for the very first time. Also, Georgie is furious when Mary listens in on a phone call with his girlfriend. And Meemaw tries to cheer up a jealous Missy.
Capt. Strand and the 126 help a husband whose wife “dies” when she is not upside down. Grace takes a call from a pizza delivery driver who is in for the shock of his life. Tommy is worried Trevor’s young daughter is a bad seed as she attempts to break them up. Paul is hesitant to go on a date with Asha, who knows him prior to his transition.
Voight employs his new informant to help solve a tricky drug trafficking case. Atwater, who once again struggles to reconcile his personal and professional life, reaches a decision.
As Torres and Sloane run protection detail for U.S. Senator John Phillips (James Morrison) in Afghanistan for the holidays, they must urgently return to the states after hearing the senator's son is in the ICU. Also, Gibbs and the team investigate the altercation that caused the life threatening injuries to the senator's son.
