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: A lonely Raj crashes the date nights of both Sheldon and Amy (their two-year anniversary) and Leonard and Penny.

In , titled " The Date Night Variable ," the social dynamics of the group shift as Howard remains in space and Raj faces intense loneliness. Feature Profile: The Date Night Variable Plot Highlights : Watch www xrysoi se The Big Bang Theory -S06E01-

Sheldon uses Raj as a "loophole" in his Relationship Agreement to outsource the "intimacy and conversation requirements" of his anniversary date. : A lonely Raj crashes the date nights

The scenes of Howard on the space station were filmed using a 20-foot replica in Canoga Park, California. To simulate , actors were supported by thin platforms while they moved to mimic the effects of microgravity. The scenes of Howard on the space station

Amy compares Sheldon to a "sexy praying mantis" after consuming alcohol. : Kevin Sussman as Stuart Bloom. Pasha D. Lychnikoff as the Russian cosmonaut, Dimitri. Carol Ann Susi providing the iconic voice of Mrs. Wolowitz. Behind the Scenes

: Howard, still on the International Space Station, finds himself caught in a vocal tug-of-war between Bernadette and his mother regarding where he will live upon his return. Key Moments :

Watch these memorable moments and reactions to the Season 6 premiere: