Leonard and Penny renew their vows, this time inviting their friends and family for wedding party; they also learn that marriage is about compromise, and figure out how to support each other. Sheldon and Amy experiment to take their relationship to the next level, and after an emotional struggle they move in together in Penny's old apartment. Howard and Bernadette realise that being a parent is a full-time job, but with the help of their friends they manage to find joy in raising their child. When his friends tell him he's extremely spoiled, Raj decides to stop taking his father's money and learn how to make ends meet.
After Leonard's father, Alfred and Sheldon's mother, Mary share an evening together, everyone deals… |
The Air Force shows interest in the guidance system the guys are building and Penny lets it slip at… |
Sheldon can't keep up with the late nights Howard and Leonard are putting in and must resort to… |
When Amy's apartment floods, she proposes a "cohabitation experiment" with Sheldon. Also, Howard… |
Leonard and Penny must separate a quarreling Sheldon and Amy when their cohabitation does not go as… |
Penny is surprised to learn she has fans of her performance in "Serial Ape-ist" when she attends… |
In order to continue living with Sheldon, Amy lies to him about repairs being made to her apartment… |
After a successful experiment combining their genes, Sheldon will stop at nothing to convince Amy… |
When Bert, a Caltech geologist, wins the MacArthur Genius fellowship, Sheldon is overcome with… |
Sheldon and Leonard must divide up their possessions and remove Penny's things from 4B. Meanwhile,… |
Amy's desire to have an intimate night with Sheldon on her birthday is interrupted by Bernadette… |
Sheldon and Amy visit Leonard and Penny for the first time since the holidays and share details… |
When Penny feels that Leonard is taking her for granted, she decides to go on a spa weekend with… |
Sheldon beta-tests an MIT invention after hearing it can help him read people's emotions. Also,… |
Leonard and Wolowitz try to distract Sheldon when he slows the progress of their guidance system.… |
Sheldon and Amy have their first fight since moving in together, and Koothrappali is shocked at the… |
The guys' annual trip to Comic Con is in doubt when Raj can't afford to go and an unexpected… |
Raj searches for a cheaper living arrangement and it creates unexpected conflict among everyone. |
Leonard, Penny and Raj adjust to their new living arrangement and Sheldon takes an interest in… |
Sheldon pushes himself to the limit when he collaborates on projects with Leonard and Wolowitz as… |
Howard and Bernadette have a hard time leaving Halley in day care when Bernadette returns to work.… |
Leonard isn’t thrilled when Penny considers taking a new job offered by her ex-boyfriend, Zack. |
After celebrating the completion of the top-secret Air Force project, Leonard, Sheldon and Howard… |
The gang is concerned when Sheldon’s former admirer, Dr. Ramona Nowitzki, resurfaces while Amy is… |