The fifth season of The Big Bang Theory settles into a solid, enjoyable groove. The original quintet of four nerds and a pretty girl has been complemented by two nerd girls, creating a dynamic social world that retains all the social awkwardness needed for comic effect. Much of the season revolves around relationships: Howard (Simon Helberg) is engaged to Bernadette (Melissa Rauch), though that bond is tested by everything from Howard getting commissioned to be an astronaut to online revelations of Howard's former sleaziness; Leonard (Johnny Galecki) and Penny (Kaley Cuoco) start dating again, this time as "Leonard & Penny 2.0," promising to treat problems as bugs that can be reported and fixed; and Sheldon (Jim Parsons) and Amy (Mayim Bialik) formalize their relationship with--what else?--a contract, though a dissatisfied Amy later decides to make Sheldon a better boyfriend through sneaky behavior modification.
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