The Big Bang Theory: The Complete Fourth Season (2010) by Warner Bross Enternaiment

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Special Features
Actor on Actor: The Big Bang's Theory of Relativity Featurette -This fun and light-hearted piece features the stars of the show conducting interviews with each other detailing their experiences working on one of the hottest comedies on television.
The Barenaked Ladies on Big Bang Theory Featurette – Having created one of the greatest theme songs in recent history, the Barenaked Ladies bring it home when they come to the set of the Big Bang Theory to record a music video for the song. Featuring an interview with the band, behind the scenes footage of the filming of an episode, and clips from the new video itself, this piece carries with it all of the fun and energy you could expect from both the band and the show.
The History of Everything Music Video
Gag Reel
This season the Big Bang gang's romantic universe expands. On the rebound from Penny, Leonard falls into the arms of Raj's sister Priya. Sheldon gets a girlfriend, or rather a friend who is a girl: Amy, a dour neurobiologist who declares herself besties with Penny. Howard and Bernadette heat up. And so do Raj and Bernadette (at least in Raj's Bollywood daydream). All in the furtherance of award-winning genius comedy.