THE BIG BANG THEORY Season 5 Episode 15 The Friendship Contraction Photos : "The Friendship Contraction" -- Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Wolowitz tries to pick his astronaut nickname, on THE BIG BANG THEORY, Thursday, Feb. 2 (8:00-8:31 PM, ET/PT) on the CBS Television Network. : Johnny Galecki, Kunal Nayyar, Simon Helberg, Jim Parsons.

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