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When Sheldon is no longer academically challenged at Medford High, he audits a college class taught by a professor.

A heated argument erupts between the Coopers and their neighbours when a new dog terrorises Sheldon.

While Sheldon is obsesses over Meemaw's budding relationship with his mentor, Dr. Sturgis, George and Mary attempt to bond with their other kids.

When Meemaw is pursued by two gentlemen callers, Sheldon interferes, forcing her to set some ground rules.

Penny tries to seduce an abstaining Leonard to ruin his 'donation' for her ex-boyfriend and his wife. Raj's cancelled bachelor party takes a turn.

The gang finds out Wil Wheaton hosts a celebrity Dungeons and Dragons game. Deception and betrayal are the path to make it to the one open seat.

While Bernadette is away and Howard is in charge of the kids, Sheldon finds a book on experimenting on kids. The guys plus Amy make a day of it.

Pemberton and Campbell charm America, so Sheldon and Amy bring Nobel laureates Kip Thorne, George Smoot and Frances Arnold to their side.

Amy has a meltdown due to the pressure associated with winning a Nobel Prize. Raj and Howard try to relive the good old days.

Raj is worried people won't take him seriously in his own field after publishing a paper that suggests he may have discovered alien life.

Kripke has proof that Dr. Pemberton plagiarized his thesis, and Sheldon and Amy aren't sure whether they should turn him in or not.

Leonard is surprised when Beverly is kind to him on a visit, until he finds out the real reason she's there. Denise and Stuart overstay their welcome.

'A Tic Disaster'. Baylen learns what Colin's work relocation means for their relationship. And she's invited to be a panellist at a Tourette's convention in Dallas.

Esmeralda faces harsh judgment during her Amish makeover, and Kendra's heartbreak pushes James to break one of the biggest Amish rules.

Inoke has a huge and potentially life-threatening bulge on his shoulder. Delano returns to see Dr. Lee and Reed has hundreds of bumps all over his chest.

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

With pandemic safety protocols in place, Dr. Lee reopens her office. Patients include Monica, who has a large birthmark growing on the side of her face.

Liz is bed-bound with severe lymphedema making it impossible to walk. She's isolated and lives with her mum who is too ill to care for her.

How Low Can I Go? Temi's religious mum refuses to come to church if she chooses a revealing dress. Plus, Jess has a growing baby bump at her wedding dress fitting.

Gok faces a huge challenge when a pregnant bride reveals her tiny budget. Plus, Clare has lost four stone and has no idea what suits her new shape.

Georgie tries to juggle his mum, his mother-in-law and Mandy on Mother's Day. Meanwhile, Audrey wants to meet Connor's girlfriend.

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.

When Sheldon is no longer academically challenged at Medford High, he audits a college class taught by a professor.

A heated argument erupts between the Coopers and their neighbours when a new dog terrorises Sheldon.

While Sheldon is obsesses over Meemaw's budding relationship with his mentor, Dr. Sturgis, George and Mary attempt to bond with their other kids.

When Meemaw is pursued by two gentlemen callers, Sheldon interferes, forcing her to set some ground rules.

Penny tries to seduce an abstaining Leonard to ruin his 'donation' for her ex-boyfriend and his wife. Raj's cancelled bachelor party takes a turn.

The gang finds out Wil Wheaton hosts a celebrity Dungeons and Dragons game. Deception and betrayal are the path to make it to the one open seat.

While Bernadette is away and Howard is in charge of the kids, Sheldon finds a book on experimenting on kids. The guys plus Amy make a day of it.

Pemberton and Campbell charm America, so Sheldon and Amy bring Nobel laureates Kip Thorne, George Smoot and Frances Arnold to their side.

Amy has a meltdown due to the pressure associated with winning a Nobel Prize. Raj and Howard try to relive the good old days.

Raj is worried people won't take him seriously in his own field after publishing a paper that suggests he may have discovered alien life.

Kripke has proof that Dr. Pemberton plagiarized his thesis, and Sheldon and Amy aren't sure whether they should turn him in or not.

Leonard is surprised when Beverly is kind to him on a visit, until he finds out the real reason she's there. Denise and Stuart overstay their welcome.

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.

A Tie Breaker & A Huge Mistake. Tensions rise when new co-owners Georgie and Ruben realise they can't agree on anything. Jim struggles to find his purpose now that he's retired.

Sheldon dismantles the refrigerator to stop an annoying hum and then must get a paper route to pay for the repairs.

When Dr. Sturgis bonds with Paige, another 10-year-old genius, Sheldon gets jealous. Meanwhile, Mary invites Paige's family over for a play date.

When Mary's faith is shaken by a tragedy in the community, Sheldon becomes an unlikely ally.

When George Sr. asks Sheldon to keep a secret from Mary, the stress of not being honest drives Sheldon to hide out at Tam's for his first sleepover.

Everything changes as Amy and Sheldon await big news. Howard and Bernadette leave their kids, while Leonard and Penny keep a secret.

Bernadette and Howard leave their kids, Penny and Leonard try to keep a secret, Sheldon and Amy stick together, and Raj makes a new friend.

Brilliant physicists Leonard and Sheldon meet new neighbour Penny, who shows them that although they're smart, they know very little about real life.

Leonard volunteers to sign for a package to make a good impression on Penny, but things go terribly awry when he enlists Sheldon for help.

Leonard is depressed to learn that Penny is dating someone. Encouraged by his friends and fellow scientists, he asks a colleague out on a date.

Sheldon gets fired and explores what life has to offer outside physics, leaving Leonard to take drastic action to snap his friend out of his funk.

Fearing he's wasting his time on Penny, Leonard makes a connection with Leslie. Meanwhile, Sheldon frets over a change to his hamburger routine.

Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz and Koothrappali through a new test of their social skills.

To save Loren's life after a catastrophic forklift accident, doctors had to cut him in half. Sofia was 29 when her heart went into end-stage failure.

Tiffany has progeria, a condition that causes her to age rapidly. Ryan was born with arthrogryposis, leaving his arms and legs fused.

Ed Gamble hosts as comedians defend unacceptable opinions. Alex Brooker argues why football shouldn't come home, and Lou Sanders says ban all pets.

John fears the large lump on his neck could become so big that it may eventually suffocate him. Shoshana is depressed because of the big growth on her forehead.

Twins Tracie and Stacie have numerous matching bumps on their heads that sometimes leak. Matt, a former Marine, has a large recurring lump in his armpit.

Unable to care for herself, Karina's weight has placed a burden on her parents. Is it too late for Karina to repair the damage to her body.

Brides-to-be Shadia and Alice both need very different outfits for their big day. Hannah has lost any excitement she had for her wedding dress hunt.

Sammi's confidence is at rock-bottom and looking in the mirror fills her with dread. Hollie is bracing herself for an appointment with her opinionated mum.

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.

A Tie Breaker & A Huge Mistake. Tensions rise when new co-owners Georgie and Ruben realise they can't agree on anything. Jim struggles to find his purpose now that he's retired.

Sheldon dismantles the refrigerator to stop an annoying hum and then must get a paper route to pay for the repairs.

When Dr. Sturgis bonds with Paige, another 10-year-old genius, Sheldon gets jealous. Meanwhile, Mary invites Paige's family over for a play date.

When Mary's faith is shaken by a tragedy in the community, Sheldon becomes an unlikely ally.

When George Sr. asks Sheldon to keep a secret from Mary, the stress of not being honest drives Sheldon to hide out at Tam's for his first sleepover.

Everything changes as Amy and Sheldon await big news. Howard and Bernadette leave their kids, while Leonard and Penny keep a secret.

Bernadette and Howard leave their kids, Penny and Leonard try to keep a secret, Sheldon and Amy stick together, and Raj makes a new friend.

Brilliant physicists Leonard and Sheldon meet new neighbour Penny, who shows them that although they're smart, they know very little about real life.

Leonard volunteers to sign for a package to make a good impression on Penny, but things go terribly awry when he enlists Sheldon for help.

Leonard is depressed to learn that Penny is dating someone. Encouraged by his friends and fellow scientists, he asks a colleague out on a date.

Sheldon gets fired and explores what life has to offer outside physics, leaving Leonard to take drastic action to snap his friend out of his funk.

Fearing he's wasting his time on Penny, Leonard makes a connection with Leslie. Meanwhile, Sheldon frets over a change to his hamburger routine.

Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz and Koothrappali through a new test of their social skills.

Georgie's upset when Mandy's new role as weekend weather girl gets her more attention from the men in town, and Connor turns to Jim for help.

A Will And A Dead Man's Wife. Georgie's not ready for his mother to start dating again. Meanwhile, Jim and Audrey struggle to make their wills.

Dr. Sturgis recommends Sheldon and Missy for a university research study on twins, and Mary is unhappy when the test results go to Sheldon's head.

Mary clashes with Sheldon's drama teacher Mr. Lundy over plans for a Halloween haunted house fundraiser for the church.

Sheldon gets into trouble with fellow child genius Paige at the Science Museum, while George Sr. is forced to play therapist to Paige's parents.

When Meemaw gives Sheldon his first video game, it takes over their lives. Meanwhile, George Sr. gets jealous when Georgie bonds with Herschel.

When Wolowitz goes AWOL with one of her friends, Penny's recruited to fill in for him on the guys' Halo team.

Raj's parents set him up on a blind date, and when he discovers he can talk to her, she shows interest in Sheldon.

When they're invited to present at a physics conference, Sheldon's reluctance to share the credit leads to a tiff between him and Leonard.

Leonard and Sheldon each lie to avoid hearing Penny sing in a production of Rent. However, Sheldon's lie becomes a bit too complicated.

With his friends knowing how sour he acts when sick and avoiding him as a result, Sheldon is nursed by Penny, who hasn't a clue what she's in for.

With Sheldon rattled after meeting Dennis, a teen physicist who's smarter than he is, the rest of the guys search for a way to eliminate the threat.

Sheldon finds himself booted from the gang's Physics Bowl team and replaced with Leslie, so he forms his own team hoping to prove he's superior.

When the delivery of a full-size prop of 1960's 'The Time Machine' causes Penny to miss work, she scolds Leonard about his sci-fi collectibles.

Hijinks ensue as Street-smart Detroit cop Axel Foley returns to L.A. to help his buddies on the force solve a series of unusual robberies.