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When Mike falls ill during a night out with Molly at the opera, Mike's mum and Molly clash over who can take better care of him.

When Vince tries to strike up a friendship with Mike by inviting him to a big basketball game, Molly isn't pleased with their newfound bond.

Molly is surprised when Mike's mum asks her to take care of her dog. Mike shocks Molly when he talks about being buried next to her.

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

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.

Penny seeks Sheldon's help to better comprehend Leonard's physics work. Wolowitz sees green when Leonard invites Bernadette to watch an experiment.

A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon.

Leonard is aghast to find out that Penny believes in psychics. Sheldon tries to assist Koothrappali in picking up a girl at a university party.

A robbery of their apartment sees Leonard and Sheldon call on their friends to devise a security system.

Stuck on the solution to a physics problem, Sheldon tries different methods to change his thinking, including working at The Cheesecake Factory.

When Leonard is offered a trip to Switzerland on Valentine's Day to see a particle accelerator, he must choose between taking Penny or Sheldon.

An appearance in traffic court comes at the worst possible time for Sheldon, the same day Stan Lee is appearing at the comic book store.

The guys go to a garage sale and find a ring from the Lord of the Rings films, and the rare find threatens their friendship.

Mike's special plans for his first Valentine's Day with Molly are thrown into jeopardy after he accidentally runs into Molly's ex-boyfriend.

Joyce & Vince, Peaches & Herb. When Mike decides that the couch is his new best friend and he doesn't want to leave the house anymore, Molly goes out on the town with her sister.

The bromance is in jeopardy! Mike and Carl get on each other's nerves after working too many double shifts together during a snowstorm.

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.

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

Sheldon's fear of speaking in front of large groups threatens his ability to accept an award, so the gang tries to help him prepare for the big night.

Sheldon squares off at the bowling alley against nemesis Wil Wheaton. Leonard's miffed over Penny's response when he says, 'I love you.

Following Leonard and Penny's break up, Sheldon tries to hide from Leonard and the gang that he had a friendly spaghetti dinner at Penny's.

A squabble over the thermostat setting leads to Leonard going over to Penny's and recounting the story of how he met and moved in with Sheldon.

Howard and Raj set Sheldon up on an Internet dating site. Penny discovers that she can't go back to dating dumb jocks after dating Leonard.

Sheldon calculates that he'll be dead before technology exists to download his consciousness into a robot, so he goes on a healthy-living binge.

Sheldon breaks up with Amy Farrah Fowler, and the guys worry when he starts replacing her with cats.

Wolowitz is embarrassed when a secret of his is revealed, and Sheldon and Raj battle at work.

19-year-old Chloe faces a life-changing diagnosis from Dr. Emma as a severe, painful skin condition puts her dream career as a hairdresser at risk.

Stuart's huge nose is severely swollen, making it hard to breathe and deeply embarrassing. Steve sees Dr. Emma about a large lump on his forehead.

Karmah hides the flaky skin on his face behind a mask and hat. Tired of being stared at, Olivia is desperate to get rid of a large keloid.

Dr. Sandra Lee treats Taylore, a young woman with unsightly elf-like bumps on her ears. Jose never goes out because of the baseball-sized lump on his head.

Mic Drop Pop! Josh has a large knot on his head sustained from a car crash 18 years ago. Brittney is covered in mysterious bumps. TJ has a curious lump protruding from his side.

Irene had to move back in with her son because her weight made it unbearable to live on her own. Dr. Now is unable to get through to her.

Once Upon A Time In The North. Jade dreams of a fairytale 'Beauty and the Beast'-themed wedding. And, Gok helps cancer survivor Raven find a gown and regain her confidence.

With an unlimited budget, Helen wants a blingy dress but Gok has other ideas. After her bone marrow transplant, Bethany returns for alterations to her gown.

Mike's special plans for his first Valentine's Day with Molly are thrown into jeopardy after he accidentally runs into Molly's ex-boyfriend.

Joyce & Vince, Peaches & Herb. When Mike decides that the couch is his new best friend and he doesn't want to leave the house anymore, Molly goes out on the town with her sister.

The bromance is in jeopardy! Mike and Carl get on each other's nerves after working too many double shifts together during a snowstorm.

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.

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

Sheldon's fear of speaking in front of large groups threatens his ability to accept an award, so the gang tries to help him prepare for the big night.

Sheldon squares off at the bowling alley against nemesis Wil Wheaton. Leonard's miffed over Penny's response when he says, 'I love you.

Following Leonard and Penny's break up, Sheldon tries to hide from Leonard and the gang that he had a friendly spaghetti dinner at Penny's.

A squabble over the thermostat setting leads to Leonard going over to Penny's and recounting the story of how he met and moved in with Sheldon.

Howard and Raj set Sheldon up on an Internet dating site. Penny discovers that she can't go back to dating dumb jocks after dating Leonard.

Sheldon calculates that he'll be dead before technology exists to download his consciousness into a robot, so he goes on a healthy-living binge.

Sheldon breaks up with Amy Farrah Fowler, and the guys worry when he starts replacing her with cats.

Wolowitz is embarrassed when a secret of his is revealed, and Sheldon and Raj battle at work.

When Peggy and Molly have lunch together, Mike worries that his mum is telling Molly unflattering stories about his childhood.

Mike and Carl's annual pilgrimage to the Chicago Cubs' Opening Day is interrupted when Molly comes along.

When Samuel loses his job and apartment, Mike offers to let him stay at his place - with interesting results.

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.

Sheldon meets Amy's mum and comes to the realisation he no longer wants to see Amy, and Leonard realises everyone is in a relationship except for him.

When Raj's sister has a one-day layover, he forbids the others from hooking up with her, unaware she and Leonard already did long ago.

The rest of the gang is interviewed by the FBI for Wolowitz's security clearance, with Sheldon accidentally letting slip some damaging information.

The guys camp out to see a print of Raiders of the Lost Ark with 21 extra seconds and are outraged to see Wil Wheaton and his friends skip the line.

Penny asks Leonard to lie to her visiting father, while Howard, Raj and Bernadette spend all night looking through a telescope.

Amy crushes on one of Penny's dim ex-boyfriends, Zack. Raj and Wolowitz argue over who'd be the better superhero.

The guys get Zack and Penny to join their Justice League costume for a New Year's Eve bash at the comic book store.

Their friendship becomes strained when Sheldon tries to take over Leonard's creation of a smartphone application that solves differential equations.

Shorna promises Adnand the ride of his life. Zena plots to confront Ebrima about his social media. Phin meets Sandra's kids in an awkward encounter.

Andy's friends worry he's been catfished. Luxury-lover Shannon is dismayed by Mete's motorhome mini-break. Phin can't cope with Sandra's huge family.

19-year-old Chloe faces a life-changing diagnosis from Dr. Emma as a severe, painful skin condition puts her dream career as a hairdresser at risk.

Stuart's huge nose is severely swollen, making it hard to breathe and deeply embarrassing. Steve sees Dr. Emma about a large lump on his forehead.

Barbara's back lump became more noticeable after she lost 131 pounds. Hilda's depression is a result of the multitude of bumps on her eyelids.

Chrystal is unable to shower without assistance from her teenage daughter. Can Dr. Now help her confront childhood trauma and turn her around her life.

Mackenna has her heart set on a floaty boho-dress, but mum has different ideas! Plus, Laura is out of her comfort zone when she's trying on dresses.

Transgender bride Sophie Rebecca longs for a princess dress, but her mum wants her to flaunt her curves. Paige seeks a dress to fit her post-pregnancy body.

When Peggy and Molly have lunch together, Mike worries that his mum is telling Molly unflattering stories about his childhood.

Mike and Carl's annual pilgrimage to the Chicago Cubs' Opening Day is interrupted when Molly comes along.

When Samuel loses his job and apartment, Mike offers to let him stay at his place - with interesting results.

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.

Sheldon meets Amy's mum and comes to the realisation he no longer wants to see Amy, and Leonard realises everyone is in a relationship except for him.

When Raj's sister has a one-day layover, he forbids the others from hooking up with her, unaware she and Leonard already did long ago.

The rest of the gang is interviewed by the FBI for Wolowitz's security clearance, with Sheldon accidentally letting slip some damaging information.

The guys camp out to see a print of Raiders of the Lost Ark with 21 extra seconds and are outraged to see Wil Wheaton and his friends skip the line.

Penny asks Leonard to lie to her visiting father, while Howard, Raj and Bernadette spend all night looking through a telescope.

Amy crushes on one of Penny's dim ex-boyfriends, Zack. Raj and Wolowitz argue over who'd be the better superhero.

The guys get Zack and Penny to join their Justice League costume for a New Year's Eve bash at the comic book store.

Their friendship becomes strained when Sheldon tries to take over Leonard's creation of a smartphone application that solves differential equations.

When Joyce invites Vince to attend her high school reunion, he confesses to Mike that he never graduated high school.

Victoria panics as her 30th birthday approaches - and drags Mike and Molly into the drama of her life crisis.

Mike feels pressured when Peggy's new boyfriend asks whether he and Molly hear wedding bells in their future.

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.

Howard is jealous when Bernadette runs into her old boyfriend at a science event they're attending.

Sheldon wants acting lessons from Penny, hoping they will make him a better teacher.

After meeting at a fundraising gala, an aged but wealthy Caltech donor makes Leonard ponder if he's willing to have sex with her to secure a donation.

Howard contemplates a serious decision in his relationship with Bernadette, and Leonard and Raj's sister start seeing each other again.

Sheldon is in a crisis when he realises he's not the epicentre of the group, so he decides to find new friends.

Leonard has a tough choice to make when Priya asks him to stop spending time with Penny, and Howard keeps pestering Sheldon with a magic trick.

The guys become sleuths to find out who hacked Sheldon's online-game account.

Sheldon and Amy decide to start rumours about themselves as a social test. Howard takes his relationship with Bernadette to an even higher level.

Rick finally meets his Malagasy Queen in person. Emma and Ziad get off to a rocky start. Aviva is in love with a Belizean pop star.