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Mandy tries to prove she's financially responsible after being called out on her poor spending habits, and Connor's girlfriend needs a place to stay.

Deadbeat. Mandy has to help Meemaw collect money from her dad when he loses some bets, while Georgie tries to intervene.

Sheldon makes a new friend who introduces him to a new field of science, while his parents disagree on how to handle Sheldon's blossoming social life.

A disappointing loss at the science fair sparks an existential crisis and sends Sheldon's life in a new direction.

When Sheldon is bullied by an unlikely character, Mary and George disagree on how to handle the situation.

When Mary bans Sheldon from reading a mature comic book, Sheldon decides it's time to assert his independence from his mother.

Leonard is caught in a tough spot when he's responsible for distributing extra grant money. Bernadette turns the backyard playhouse into a hideaway.

Sheldon tries to bond with Amy's father, but Howard lures Mr. Fowler away with magic tricks. Raj and Anu try to get physical for the first time.

Sheldon and Amy are devastated learning that Super Asymmetry has been discovered and disproven. Bernadette asks Denise to help her win a videogame.

A VHS tape inspires Sheldon to not give up on his and Amy's theory. Bernadette turns into a pageant mom over Howard's Magic Castle audition.

Penny and Leonard organise a paintball game that results in mayhem. Raj catches Anu with her ex, and Stuart doesn't want to move in with Denise.

Penny's ex, Zack, and his wife want a baby, but when Zack is infertile, they ask Leonard to help. Raj attempts to mend things with his ex-fiancée.

Sheldon and Amy's theory is proven by two physicists, who then try to kick Amy off the Nobel nomination. Bernadette has a big success at work.

Sheldon helps Bernadette and Howard navigate bureaucratic paperwork. Leonard is disappointed when his friends exclude him from a scientific project.

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.

'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.