The Big Bang Theory Complete Seasons 1-4, 1 2 3 4 

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Season 1
Johnny Galecki (ROSEANNE) and Jim Parsons (JUDGING AMY) star as two socially inept scientists who, while accustomed to probing the secrets of the universe, are totally unprepared for the greatest mystery of all: women. When a beautiful blonde, Penny (Kaley Cuoco), moves next door and invades their dweebish den, these friends have their lives turned upside down. Plenty of hijinks are in store for the two roommates as they get a crash course in the ways of the opposite sex. This collection presents every episode of the show's first season, featuring a theme song performed by Barenaked Ladies.

Season 2
Johnny Galecki (ROSEANNE) and Jim Parsons (JUDGING AMY) star as Leonard and Sheldon, two socially inept scientists who, while accustomed to probing the secrets of the universe, are totally unprepared for the greatest mystery of all: women. When a beautiful blonde, Penny (Kaley Cuoco), moves next door and invades their dweebish den, these friends have their lives turned upside down. Plenty of hijinks are in store for the two roommates as they get a crash course in the ways of the opposite sex. In the second season, both Leonard and Sheldon find love, but will they also find the answers to complex astrophysics equations?

Season 3
This release includes all 23 episodes of the brainy sitcom THE BIG BANG THEORY, following the romantic and practical misadventures of two genius physicists, who are at the top of their fields in science, but at the bottom of the totem in playing the field. The two continually attempt to bring their social skills into par with their laboratory skills, and living across the hall from a charming blonde actress gives them plenty of motivation.

Season 4
The fourth season of THE BIG BANG THEORY finds Leonard (Johnny Galecki) falling for Raj's sister Priya following his break-up with Penny (Kaley Cuoco). Meanwhile, Sheldon (Simon Helberg) finds romance with a neurologist who quickly establishes herself as Penny's new best friend. As Howard and Bernadette's relationship blossoms, Bernadette finds herself plagued by Bollywood daydreams starring Raj (Kunal Nayyar).