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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.

Georgie and Mandy get fed up staying with her parents and reconsider their living situation after a fight with Mandy's mum, Audrey.

Georgie struggles to balance life, work and family. Mandy worries for Georgie's wellbeing and Missy gets into trouble at school.