Source: http://the-big-bang-theory.com/
CBS has announced the details of Episode 2.11, The Bath Item Gift Hypothesis, which will air December 15th.
"The Bath Item Gift Hypothesis" – Christmas is a source of stress for Leonard – whose handsome colleague starts dating Penny – and his friends, who are being tormented by Sheldon’s obsession with gift-giving etiquette, on THE BIG BANG THEORY, Monday, Dec. 15 (8:00-8:30 PM, ET/PT) on the CBS Television Network.