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Mary gets Pastor Jeff involved when Sheldon isn't invited to Billy's birthday party. George, meanwhile, has 'male-bonding time' with Dr. Sturgis.

Sheldon fakes being sick to avoid a swim test at school. Meanwhile, Dr. Sturgis spies on Meemaw's new boyfriend.

George and Meemaw struggle to manage the Cooper household while Mary plans Pastor Jeff's wedding.

Sheldon catches a struggling Paige shoplifting. Meanwhile, George Sr. is furious when Georgie tries to buy his way out of chores.

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.

Amy and Leonard try to help Sheldon when his accidental scientific discovery is disproved. Howard and Bernadette open their home to Raj for a week.

With Sheldon in Texas, the gang decorates for Christmas, and they each contemplate if they would have had a wonderful life if they'd never met him.

Penny turns to Leonard after her guest appearance doesn't turn out well. Sheldon works on his sense of humour, and Raj practices talking to girls.

Penny makes a big step toward pursuing a full-time acting career, and Sheldon is forced to take a vacation.

Unable to score tickets for Comic-Con, Sheldon decides to stage his own comic-book convention, while the ladies attempt to act like grown-ups.

Amy talks Sheldon into a romantic Valentine's Day getaway to Napa Valley. Leonard and Penny make an emergency visit to the vet with Raj's dog.

Leonard's purchase of a new dining room table doesn't sit well with Sheldon, and Bernadette isn't happy about Howard taking another trip to space.

Things turn rocky between Sheldon and Wolowitz, and Bernadette steps in to mediate. Penny is offered a movie role that may prove embarrassing.

Sheldon's visit to see his mummy forces him to start addressing a new reality. The gang speculate about where they might be in 20 years.

Raj wrestles with dating two women at the same time, Penny is offered a part in a trashy movie, and Sheldon can't decide between two gaming systems.

Raj and Howard double-date, and the latter is flushed with embarrassment after Raj's girlfriend reveals a secret she knows about Howard.

Leonard reinstates Anything Can Happen Thursday, and Sheldon attempts something spontaneous. Raj requests help from Howard in prepping for a date.

Sheldon receives counselling from his childhood TV idol, while Penny and Leonard reach a relationship milestone and turn it into a competition.

A trying day at the movie shoot makes Penny question her life choices. Caring for a bedridden Mrs. Wolowitz is a challenge for Howard and Bernadette.

Sheldon gets caught up in all the life-altering changes going on around him and considers a monumental move. Raj and Emily take it to the next level.

Amy and Leonard take a road trip, Penny has an interview at Bernadette's company, and Howard has issues with Stuart's relationship with his mum.

Howard signs up to take Sheldon's class, and tensions between Penny and Bernadette give Amy an opportunity to play one against the other.

NASA asks Wolowitz to throw the first pitch at an Angels baseball game. And Sheldon says that he and Amy are a better couple than Leonard and Penny.

Raj's girlfriend gives Penny the cold shoulder after he tells her about their history, and the guys consider buying into Stuart's comic-book emporium.

Amy and Bernadette accuse Penny of becoming a party pooper. And the guys brainstorm about inventing something cool.

Georgie worries that he's leaving Connor out of his new project with Jim. Meanwhile, Mandy and Audrey struggle to decorate CeeCee's nursery.

Tensions rise when Georgie intrudes on Mandy's new sales gig. Meanwhile, Audrey's conflicted when Jim makes it a point not to coddle Connor.

Dara Ó Briain introduces topical chat and hilarious games with guests Rhys James, Ahir Shah, Angela Barnes, Lou Sanders, Ed Byrne and Milton Jones.

Dara Ó Briain introduces topical chat and hilarious games with guests Rhys James, Ahir Shah, Angela Barnes, Sara Pascoe, Ed Byrne and Russell Howard.

Guz upgrades his S2000 with a thunderous stereo. Plus, he meets sound guru Iceman Ian and learns drifting tips from Aleyna.

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

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.

When bride E'terica's fiancé questions her taste in wedding gowns, he also tests her self-esteem. Plus, Katy's mum isn't ready let go of her daughter.

After five years in a scooter, Latonya's weight has made her almost immobile. She doesn't want to give up her food comforts, but will she do it for love.

A Dress To Match My Black Heart. Feisty Camila's desire to buy a black dress may push her equally fiery mother over the edge! Plus, will Ally's second custom dress arrive in time.

Shopaholic Courtney wants to look at every dress in Kleinfeld! Brianna wants a '50 Shades'-themed frock. Angela craves a tasteful gown for her circus wedding.

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

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.

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.

Sheldon receives counselling from his childhood TV idol, while Penny and Leonard reach a relationship milestone and turn it into a competition.

A trying day at the movie shoot makes Penny question her life choices. Caring for a bedridden Mrs. Wolowitz is a challenge for Howard and Bernadette.

Sheldon gets caught up in all the life-altering changes going on around him and considers a monumental move. Raj and Emily take it to the next level.

Amy and Leonard take a road trip, Penny has an interview at Bernadette's company, and Howard has issues with Stuart's relationship with his mum.

Howard signs up to take Sheldon's class, and tensions between Penny and Bernadette give Amy an opportunity to play one against the other.

NASA asks Wolowitz to throw the first pitch at an Angels baseball game. And Sheldon says that he and Amy are a better couple than Leonard and Penny.

Raj's girlfriend gives Penny the cold shoulder after he tells her about their history, and the guys consider buying into Stuart's comic-book emporium.

Amy and Bernadette accuse Penny of becoming a party pooper. And the guys brainstorm about inventing something cool.

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

Mike dresses as Santa but feels more like the Grinch when he can't contain his frustrations over Molly's Christmas spending.

In an effort to boost their chances of getting pregnant, Molly encourages Mike to join her in giving up caffeine and eating healthier.

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.

Sheldon and Raj go on an expedition that turns into a test of how long before they get under each other's skin. Leonard and Penny argue about money.

Penny's sales pitch leaves a doctor-client smitten and the guys help her deal with it, and Bernadette and Amy debate female scientists and sexuality.

Amy and Bernadette organise a prom to be held atop the guys' apartment complex, but Sheldon is leery of all the prom pomp, circumstance and romancing.

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.

Stephen Collins, 7th Heaven's beloved dad and moral icon, fell from grace in 2014 when a recording revealed his admission to unthinkable crimes.

Adea Shabani crossed oceans to pursue her Hollywood dreams. When she suddenly goes missing, investigators pray she won't become one of the city's lost angels.

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.

Terry's nose growth has prevented him from meeting his grandkids. And, Remi has alligator-like skin and is not used to taking care of herself.

Wess gets off to a great start in Dr. Now's programme, shedding weight quickly. But when the cravings continue after surgery, Dr. Now sends him to therapy.

'Doga' instructor Mariah seeks a princess dress and wants her pup Coco to match! Jami is eloping to Paris and she needs a dress as magical as her destination.

Cat and her fiancée Nicole both need dresses for their beach wedding. The challenge is to find two different gowns, that are still complementary.

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

Mike dresses as Santa but feels more like the Grinch when he can't contain his frustrations over Molly's Christmas spending.

In an effort to boost their chances of getting pregnant, Molly encourages Mike to join her in giving up caffeine and eating healthier.

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.

Sheldon and Raj go on an expedition that turns into a test of how long before they get under each other's skin. Leonard and Penny argue about money.

Penny's sales pitch leaves a doctor-client smitten and the guys help her deal with it, and Bernadette and Amy debate female scientists and sexuality.

Amy and Bernadette organise a prom to be held atop the guys' apartment complex, but Sheldon is leery of all the prom pomp, circumstance and romancing.

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.

Mike risks losing his eyebrows when he starts construction on the basement for he and Molly, while Carl invites Samuel to move in with him.

Mike and Molly encourage Harry to take Victoria on a date for Valentine's Day, and everyone is shocked when she accepts.

Mike studies male fertility and visits a clinic to ensure that his 'swimmers' are up to the task of starting a family with Molly.

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.

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.

Dara Ó Briain introduces topical chat and hilarious games with guests Rhys James, Ahir Shah, Angela Barnes, Lou Sanders, Ed Byrne and Milton Jones.

An insurance agent's perfect routine begins to unravel when he starts suspecting that his entire world is part of a massive television production.