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When Sheldon tries to be spontaneous, it leads to unexpected friction between Penny, Amy and Bernadette. Meanwhile, Raj seeks Howard's help in preparing for a date with Emily.
Sheldon faces a personal crisis after deciding he's wasting his time with string theory. Meanwhile, a double date between Raj, Emily and the Wolowitzes ends in embarrassment for Howard.
Professor Proton helps Sheldon cope with grief, while Leonard turns a relationship milestone into a competition with Penny. Meanwhile, Amy and Bernadette make a "Star Wars Day" gift for the guys.
Sheldon and Amy's relationship takes a step forward, Penny makes big decisions in her professional and person life, Raj tries to prosper in the dating world with his newfound ability to talk to women, and Howard treats Bernadette to a very special surprise for the anniversary of their first date.