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After Dr. Sturgis experiences a nervous breakdown, Mary worries Sheldon is headed down a similar path. Georgie finds he has a knack for sales.

Without Dr. Sturgis's university class, Sheldon takes his education into his own hands. Mary helps Pastor Jeff avoid temptation with his girlfriend.

Sheldon leaves town after a fight with Meemaw and his parents. Meanwhile, Georgie tries to impress Veronica with his new business venture.

Sheldon's obsession with The Lord of the Rings leads to an unhealthy habit. Missy asks her dad to teach her how to play catch.

After being released from the psychiatric hospital, Dr. Sturgis unexpectedly breaks up with Meemaw.

A Parasol And A Hell Of An Arm. A church carnival leads Missy to try out for the baseball team. Meanwhile, Meemaw struggles after her breakup with Dr. Sturgis.

Mandy struggles to get Georgie's family to join him for his first Thanksgiving without his dad.

Georgie joins a church to sell tires to the congregation. Mandy worries there is more to the story than that.

Outraged that he's being forced to work with his university nemesis, Barry Kripke, Sheldon faces a crisis of conscience.

When Sheldon and Leonard fight, it affects Penny and Amy's living arrangements. Meanwhile, Raj takes care of Mrs. Wolowitz while Howard is away.

While the guys try to give their significant others the perfect Valentine's Day, Raj and Stuart throw a lonely people party at the comic book store.

After a terrible date, Raj vows to never leave his apartment again. Meanwhile, Penny actually impresses Sheldon with her acting skills.

Leonard, Sheldon and Howard try to advance the cause of women in science by speaking with junior high girls about their future careers.

When Howard finds a letter from his father, he's forced to confront his past. And Leonard and Penny throw a grown-up cocktail party at the apartment.

Let the battle begin! Leonard, Sheldon and Raj fight for tenure at the University - and the competition heats up when the girls get involved.

After one of his favourite TV shows gets cancelled too soon, Sheldon feels lost, so Amy tries to help him get over his compulsive need for closure.

Leonard and Sheldon hire Professor Proton, the host of their favourite childhood TV show, to perform. Raj leaves his dog with Howard and Bernadette.

When the girls' trip to Vegas falls through, the guys invite them to a Dungeons & Dragons date. Meanwhile, Raj and Lucy go on an awkward date.

When Leonard is offered an exciting new job opportunity overseas, Sheldon grows jealous. Raj pushes Lucy a little too far in their relationship.

Leonard is away at sea, so Sheldon and Penny spend time together and spill some revealing secrets. Howard comes to Raj's aid after a breakup.

Leonard returns from his expedition and finds things chilly between him and Sheldon, and Howard faces questions about his masculinity.

Raj puts together a scientific scavenger hunt that turns into serious, cutthroat competition that brings out the best - and the worst - in the gang.

Amy ruins one of Sheldon's favourite films. Leonard discovers how to get Penny to do his bidding. Raj and Stuart get creative with dating profiles.

Amy takes a job at Sheldon's university, putting their relationship to the test. Howard ends up sleeping on Raj's couch after a fight with Bernadette.

Sheldon fears his major scientific breakthrough may haunt him for the rest of his career. Howard makes a grand romantic gesture to Bernadette.

When Sheldon's childhood hero, Professor Proton, seeks Leonard's help with an experiment, Sheldon decides to befriend another TV science guy.

Leonard fails to stop Sheldon from overreacting after a past slight comes to light, and Penny has a run-in with Raj's former girlfriend Lucy.

Howard's mother has a say when he and Bernadette host Thanksgiving dinner for the gang. Penny and Leonard must deal with a mistake from her past.

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

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

Sheldon starts the first internet flame war, and Meemaw is unhappy when George spends time with her new boyfriend.

The university tries to recruit Sheldon, through George. Georgie gets a job working for Meemaw's new boyfriend. Mary decides to rid her home of greed.

Covered in bumps, Keke is embarrassed to be intimate with her husband. Corey has been labelled a devil worshipper because of his forehead growth.

Geno was raised with lots of love and food but now he's living with his mum and eating himself to death. He and his cousin pledge to both lose weight.

Excitement's in the air for both the brides and Randy who's going back to his bridal design roots! Jenni Pulos has a surprise for her friend, bride Monica.

Randy Just Showed You The Door! Twins Marlo and Margo visit the salon but a major secret threatens to sabotage the fitting. Plus, Bride Val wants a gown fit for her icy wedding.

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.