Season Finale: The gang is concerned when Sheldon's former admirer, Dr. Ramona Nowitzki, resurfaces while Amy is away at Princeton.
After Leonard, Sheldon and Wolowitz celebrate the completion of the top secret air force project, they are met with an unpleasant surprise.
Leonard isn't thrilled when Penny considers taking a new job offer from her ex-boyfriend.
Howard and Bernadette have a hard time leaving Halley in day care when Bernadette returns to work.
Sheldon pushes himself to the limit when he collaborates on projects with Leonard and Wolowitz as well as Amy on the same day.
Leonard, Penny and Raj adjust to their new living arrangement, and Sheldon takes an interest in Amy's work.
When Raj moves out of his apartment, Leonard and Penny offer him Sheldon's old room.
With Koothrappali cut off from his father's fortune, he appoints Sheldon to help him get out of debt. Also, Penny considers joining Leonard at Comic-Con.
Sheldon and Amy have their first fight since moving in together, and Koothrappali is shocked at the realities of financial independence when he stops receiving support from his father.
Leonard and Wolowitz try to distract Sheldon when he slows the progress of their guidance system. Also, Penny and Amy take Bernadette for a night out.
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