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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 campaigns to become Dr. Linkletter's lab assistant. Georgie enlists the drama teacher, to help with a surprising business venture.

Dr. Linkletter pushes Sheldon to make friends with his fellow students, and Georgie gets a pager.

Sheldon, Dr. Linkletter and Meemaw team up on a science experiment. Mary is jealous that Pastor Jeff and Brenda are spending so much time together.

When Wolowitz gets to work with world-renowned scientist, Stephen Hawking, Sheldon is willing to do anything to meet his hero.

Howard's wedding plans are in jeopardy after the guys throw him a bachelor party, and details of his sexual history are leaked online.

When NASA reschedules Howard's mission and puts his wedding plans in jeopardy, he's forced to face his fears - and Bernadette's dad.

When Howard and Bernadette decide they want to be married before his NASA space launch, the gang rushes to put on a wedding.

Howard discovers that he can't escape his mother - even in space! Back on earth, meanwhile, Raj turns his existence as a third wheel into an art form.

After learning Penny is thinking about breaking up with Leonard, Sheldon tries to intervene. Howard is being picked on in space by the astronauts.

While the pressure of being in space starts to take its toll on Howard, Amy feels threatened when Sheldon hires a young female assistant, Alex.

When Howard returns from space, he doesn't get the hero's welcome he expected. Meanwhile, Game Night turns into a battle of the sexes.

The gang celebrates Halloween at Stuart's comic book store. Leonard and Penny discover a new spark in their relationship with a scientific seduction.

Sheldon's friendship with renowned scientist Stephen Hawking is threatened by a game of 'Words with Friends.

Bernadette pressures Howard to move out of his mother's house. Sheldon finds himself caught in the middle of a fight between Amy and Wil Wheaton.

Howard and Raj try to understand why Sheldon disappears every afternoon at 2:45. Leonard and Penny wrestle with jealousy in their relationship.

When the University reassigns Sheldon's unused parking spot to Howard, the ensuing turf battle affects the whole gang.

Sheldon plays nursemaid to a sick Amy, while Howard attempts to bond with his father-in-law on an upcoming fishing trip.

Sheldon unwillingly revisits some Christmas memories during a lively game of Dungeons and Dragons, while Raj joins the girls for ladies' night out.

Sheldon is accused of sexual harassment at the University and winds up dragging Leonard, Raj and Howard into the fray.

Leonard's car is stolen when the guys take a road trip to a comic book convention in Bakersfield, dressed as Star Trek characters.

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.

Roger returns and hope Dr. Lee can help with his gigantic nose growths. Christine has lost her essence due to a large growth on her shoulder.

Lookin' For Love In Lumpy Places. Gabriel has a huge growth on his clavicle but is terrified of surgery. Karen has dealt with painful, scaly feet for 22 years with no diagnosis.

Ruben is a personal trainer whose head growth has prevented him from seeing clients. Kaitlin has blue marks and scars due to long-term drug use.

Holy Cyst?! Kenny's rare condition causes hundreds of lumps to grow all over his body. Plus, Paula's painful and swollen feet ooze a foul-smelling substance.

Jacqueline's shoulder growth makes it difficult to do fire spinning, her favourite hobby. And the mysterious bump on James' cheek loves to bleed.

Alexis has searched everywhere for a certain gown, only to now find it's double her budget. Jenna's dream dress turns into a nightmare.

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.

Wedding dress shopping can be an emotional rollercoaster. Kayleigh wants something princess-worthy, while Bec is in panic mode with last minute adjustments.

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.

Becka dreams of a princess gown, but her mum prefers a more fitted look. Stacey and her future mother-in-law love a Cinderella style but can't agree on the dress.

The Geezer Bus And A New Model. Sheldon refuses to ride in a car after getting into an accident with Meemaw. Meemaw is forced to take the church shuttle.

When the IRS accuses Sheldon of making a mistake, he stops at nothing to prove them wrong. Meanwhile, Dale is forced to get a colonoscopy.

Sheldon faces consequences after installing a pirated computer game. Mary and Meemaw take Brenda out for Girls Night, and George watches Billy.

Sheldon is at odds with Paige once again when she considers enrolling at East Texas Tech. Mary seeks the advice of June when looking for a change.

The Coopers discuss the possibilities of black holes and alternate universes when Dr. Sturgis comes over for dinner.

Missy's first heartbreak triggers a series of events that lead the Cooper family to the brink.

Georgie and Mandy get upset when Audrey disciplines CeeCee without their permission.

Georgie's feud with a rival store threatens his partnership with Ruben. Meanwhile, Mandy finds out Georgie's been keeping secrets from her.

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.

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.

Dara Ó Briain hosts another hour of topical fun with the help of Rhys James, Ed Byrne, Janine Harouni, Harriet Kemsley, Glenn Moore and Ahir Shah.

Ed Gamble hosts as comedians Ivo Graham back state support for public school kids and Lucy Beaumont says all Prime Ministers should be Southerners.

Dara Ó Briain hosts another hour of topical fun with the help of Rhys James, Ed Byrne, Janine Harouni, Harriet Kemsley, Glenn Moore and Ahir Shah.