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When Mike moves in with Molly and her family, he has to adjust from life in his bachelor pad to a house full of women.

While Molly's trying to save money for their wedding, Mike is lured into buying Vince's 1957 Chevy Bel Air - without telling her first.

Despite Mike's good intentions, he adds fuel to the fire when he finds himself caught in the middle of a fight between Molly and her family.

George and Georgie go camping with Meemaw's new boyfriend, Dale, but things get complicated when her ex-boyfriend tags along.

Sheldon and Georgie bond over a money-making opportunity. Meanwhile, Mary is concerned when Missy misuses religion.

Meemaw meets Dale's ex-wife, while Sheldon is forced to work on a group project with reluctant college students.

Amy plans a Victorian dinner for Christmas Eve, while Raj, Leonard and Howard try to remove a pigeon that flew into the clean room at the university.

Raj awaits data from a space probe in which he was involved. Later, Leonard and Sheldon go dress shopping with Penny and Amy.

Sheldon becomes concerned that his cushy lifestyle is impacting his professional progress, so he asks the gang to make life more difficult for him.

An online troll rips Leonard and Sheldon's physics paper, and a girls' night out leads to Penny, Amy and Bernadette dishing about embarrassing events.

Howard gets unsettling news amidst the excitement of the comic book store reopening, and Penny doesn't practice what she preaches.

An experiment designed to make people fall in love piques Penny and Leonard's interest. Meanwhile, Leonard, Amy, Raj and Emily encounter a 'zombie.

There's trouble in paradise when Amy learns Sheldon signed up for a one-way mission to colonise Mars. Leonard makes an 'adult' purchase for Penny.

An electrical short thaws the last meal cooked by Mrs. Wolowitz, and Sheldon and Leonard's work is featured in a magazine, but only one gets credit.

Mike's spooked when Molly's boss invites them to a party on Halloween, a holiday he dreads.

Carl tries to make a love connection and get a date with an attractive woman who's clearly out of his league.

When Mike encourages his mum, Peggy, to get a job, he never imagines how it will interfere with Molly's life.

Sheldon visits CalTech for the first time. Meanwhile, Georgie is furious when Mary listens in on a phone call with his girlfriend.

Sheldon accuses Dr. Sturgis of plagiarism. Georgie has an awkward run-in with Veronica while on a date with his new girlfriend, Jana.

When George Sr. accidentally lands the school librarian in the hospital, the Cooper family look after her. Meemaw gives Georgie relationship advice.

Leonard and Sheldon consider dropping by George Lucas' Skywalker Ranch when a speaking engagement puts them nearby.

Sheldon and Amy reach a crossroad, a man claiming to be Wolowitz's half-brother shows up, and Penny and Leonard argue live on Wil Wheaton's podcast.

NASA asks Raj to craft a message for aliens in the event of contact, and Penny must choose between an audition or her job in pharmaceutical sales.

Wolowitz and Sheldon can't get a drone to fly, Leonard nearly misses giving a commencement address, and Raj pits his parents against each other.

Leonard and Sheldon's mothers come to town to celebrate their sons getting an award, but the opinionated women engage in an altercation over religion.

Leonard and Penny are pressured to set a wedding date by Sheldon, whose relationship with Amy has taken an interesting turn.

Penny has a problem dealing with Leonard's confession about having kissed another woman, while Sheldon is confused about Amy calling a time out.

To ease Penny's mind, Leonard pays a visit to the woman he kissed during his expedition to the North Sea. Sheldon's breakup leads him to retaliate.

Dara Ó Briain hosts more laughter filled game play with guests Rhys James, Angela Barnes, Sarah Keyworth, Glenn Moore, Milton Jones and Ahir Shah.

A weekend in Spain's legendary party town. Sara and Roisin join a hen party, eat a roast in the sun and - of course - visit a torture museum.