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Molly is mortified when she reviews her wedding photos and sees that Mike either has his mouth open or his eyes closed in every single shot.

Mike and Molly decide they're ready to start trying for a baby. And Carl gets upset when he learns that Molly is still spending time with Christina.

Mike is put in an uncomfortable situation when his mom starts dating his boss, despite his many reservations.

Bible Camp And A Chariot Of Love. Sheldon ends up in a fierce competition with Paige after their mums force them to attend Vacation Bible School. Georgie makes a questionable purchase.

While Mary and George take a trip, Georgie freaks out when his girlfriend thinks she's pregnant. Dale and Meemaw work out their relationship issues.

While college orientation does not go as Sheldon planned, Mary is mistaken for a university student and invited to a party.

Sheldon and Amy spend Thanksgiving at the aquarium, Wolowitz volunteers at a soup kitchen, and Penny realises that Leonard knows a lot about her.

God only knows what song is constantly playing in Sheldon's head, but it reminds him of Amy and leads to a surprising revelation.

Professor Proton visits Sheldon in a dream and gives him Obi-Wan-like advice about whether to go see the new Star Wars film or spend time with Amy.

Penny entices Leonard to meet with a psychiatrist, Stuart moves out of the Wolowitz house, and Howard and Bernadette find themselves at a loss.

Dealing with an under-the-weather Sheldon is draining for Penny, Leonard and the gang so they decide to treat themselves to a Sheldon-less weekend.

Sheldon's Meemaw visits and there's friction between her and Amy, which intensifies after the elderly woman blurts out a secret about Sheldon.

Sheldon and Amy celebrate Valentine's Day, Leonard and Penny feel the pangs of aging, and Howard and Bernadette find a surprise in their hot tub.

The gang learns Bernadette is pregnant and celebrates with karaoke. Meanwhile, Howard freaks out, convinced he must make more money for the baby.

With the house feeling crowded, Molly decides to have a yard sale, while Mike and the guys take Carl on a fishing trip.

When Mike gets sick for Thanksgiving, Molly is excited that she won't have to cook until Vince invites his brother, Frankie, to town.

Molly encourages Mike to pursue a detective position on the force, but the stress of taking the qualification exam starts to take a toll.

Sheldon's first day of college is derailed by his new philosophy teacher. Mary and Brenda live vicariously through Missy's first day of middle school.

Meemaw takes matters into her own hands when Sheldon's philosophy teacher, Professor Ericson, sends him into a tailspin.

Sheldon and his dad dine with President Hagemeyer and a university benefactor. Also, Dale and his ex-wife invite Meemaw to their son's wedding.

Sheldon and the gang celebrate his birthday and he's surprised by a special guest.

Howard reconsiders entering into a legal partnership with Leonard and Sheldon, and the women offer Raj dating advice.

Sheldon shocks Amy with a startling revelation after she buys him a laptop. Raj throws Leonard and Howard under the bus when they lie to their wives.

Sheldon shares a secret about Leonard when the two go on a weekend trip with Penny and Amy; Raj goes all out with pregnancy gifts.

During a group get-together, a minor argument between Sheldon and Leonard turns into a heated debate, leaving the rest of the gang to choose sides.

Sheldon stays with Bernadette while the rest of the gang attends an event where they run into Penny's former boyfriend and meet Raj's girlfriend.

Sheldon hires Stuart to spend the day with Amy. Meanwhile Leonard's mother visits, and Penny just can't seem to connect with her.

Leonard's recently divorced parents roll into town, as does Sheldon's holy-roller mother, and all hell breaks loose.

Lisa faces the fallout of her lies. Aviva gets answers about Stig's infidelity, Elise finally meets Joshua, and Rick tries to regain Trish's trust.

Georgie panics when he learns that Jim is considering selling the tire store to his rival, and Mandy's forced to confront a long-running lie.

Tensions rise when Georgie finds out the truth about Mandy's boss, and Georgie does all he can to buy the tire store before Jim sells it.

Monica returns in the hopes that Dr. Lee can remove more of her face growths. Ken has several large cysts on his head that he has tried to remove on his own.

Corey is a drag queen and has a bump dangling from his backside. And, the large growths on Virginia's upper arms make it difficult to travel in her RV.

After a tough childhood with an abusive stepfather and drug-addicted mother, Sarah weighs over 600 lbs and is fighting for her life at 24 years old.

To Show Or Not To Show. Sacha wants a dress that pushes the envelope and helps her shine. And, new mum Amy wants a gown that will really wow her fiancé.

The Feel Good, Look Good Show. Emily hates to shop, so she's relying on her BFFs - will they choose style or comfort? Hayley's pregnancy means a new gown to accommodate a baby bump.

The Princess At Any Cost Show. Hayley falls in love with a princess gown that threatens the budget. Plus, real-life princess Nana has her final fitting, but will her mother approve.

Fussy bride Gina has been to 20 stores and tried on over 50 dresses! She pins all her hopes on David but can he deliver where so many others have failed.

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.

When Sheldon learns the house next door is for sale, he looks for the perfect neighbours. Missy pitches against her boyfriend at the baseball game.

Sheldon has a scientific breakthrough at the dentist. Dale and Meemaw go to the casino. Georgie makes a mistake when he's left in charge of the store.

Sheldon discovers that Mary's been keeping a secret about his future. Also, Meemaw is furious when she learns that Dale fired Georgie.

Georgie panics when he learns that Jim is considering selling the tire store to his rival, and Mandy's forced to confront a long-running lie.

Tensions rise when Georgie finds out the truth about Mandy's boss, and Georgie does all he can to buy the tire store before Jim sells it.

Leonard needs surgery for a deviated septum, and Sheldon feels an operation is too dangerous and that his roommate may not make it out alive.

Sheldon bids farewell to his Fun With Flags podcast. Leonard, Howard and Raj probe a late professor's research in search of some hidden significance.

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.

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.

The guys surprise Leonard with a belated bachelor-party weekend in Mexico, but their plans hit a bump in the road when they get a flat tire.

Sheldon reverts to 2003 when he learns that Leonard and Penny are moving in together, while Howard and Raj form a band to play at the comic store.

Dara Ó Briain introduces an end of series special featuring a look back at the best bits, hilarious out-takes and some brand-new material.

Emma and Adam set up a seemingly perfect arrangement: no strings attached. But when a fling becomes a thing, can sex friends stay best friends.