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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.

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.

Priya uses her legal expertise to rip apart Sheldon's roommate agreement, and the women take the flustered Sheldon out dancing.

Raj makes an attempt to cure his phobia of talking to women, and Penny spies on Leonard and Priya with the help of Bernadette.

Mrs. Wolowitz ends up in the hospital after Howard tells her he's marrying Bernadette. While there, Leonard stresses over Penny and Priya.

Mrs. Wolowitz ends up in the hospital after Howard tells her he's marrying Bernadette. While there, Leonard stresses over Penny and Priya.

Penny worries that she's screwed things up permanently with her friends after her night with Raj, while Sheldon takes command of the paintball team.

When the President's friend is murdered, CIA agent Jack Ryan takes on a Colombian drug cartel, only to discover corruption within his own government.

Firefighter Jimmy has numerous torso bumps that make it painful to play with his young son. Plus, Steven has a mystery bump on the back of his head.

John would love to date but is embarrassed about a huge bump on his cheek. Denise sees Dr. Lee about a growth on her booty.

When musician Travis got too big to walk down the aisle, he promised his wife a proper wedding one day. Since then he's only gained weight. Can Dr. Now help him.

Emily and her very opinionated father want the perfect princess ball gown for her big day. Melissa worries her conservative dad will not like her custom Pnina gown.

Eccentric Marlene wants a feathered or black ball gown, but her parents prefer something traditional. Jessica loves every dress, but her family likes none.

HuffPost Live correspondent and host, Caitlyn Becker, is torn between two dresses. Candace declares the first gown she wears is her dream dress.

Jamie is devastated when she falls in love with an over-budget gown. Plus, Natalie has trouble committing to a dress in the absence of her ill mother.

Molly has high hopes that a fitness tracking device will encourage Mike to be more active. But Mike has other plans for it.

After Peg suffers a heart attack after a heated argument with Molly, Mike blames his wife, who immediately sets out to make amends.

Mike becomes hyper-vigilant after his wallet is stolen from the squad car while taking a nap.

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.

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.

Priya uses her legal expertise to rip apart Sheldon's roommate agreement, and the women take the flustered Sheldon out dancing.

Raj makes an attempt to cure his phobia of talking to women, and Penny spies on Leonard and Priya with the help of Bernadette.

Mrs. Wolowitz ends up in the hospital after Howard tells her he's marrying Bernadette. While there, Leonard stresses over Penny and Priya.

Mrs. Wolowitz ends up in the hospital after Howard tells her he's marrying Bernadette. While there, Leonard stresses over Penny and Priya.

Penny worries that she's screwed things up permanently with her friends after her night with Raj, while Sheldon takes command of the paintball team.

Molly is shocked when Joyce reveals she's leaving the house to Victoria in her will.

Molly's leisure activities between novels become an issue for Mike. Tensions rise as he wants her to be the perfect homemaker.

Mike is excited to bring a new stray dog into the home. But Molly isn't so sure and has trouble warming up to the new family member.

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.

Leonard and Amy get to know each other better at a co-worker's wedding. Howard and Bernadette spend the weekend with Mrs. Wolowitz.

Raj is upset he's the only one of the four guys who's not in a relationship, so Penny sets out to find the perfect date.

Sheldon and Leonard get invited to a housewarming party at Wil Wheaton's house. Howard gets an out-of-this-world opportunity.

Craving a little motherly love, Sheldon competes with the gang for his mother's attention when she comes to visit.

A cute comic book artist tests Leonard's relationship with Priya, while Sheldon, getting into the Halloween spirit, tries to scare the guys.

Amy is heartbroken when Bernadette and Penny go shopping for wedding dresses without her.

Can friends with benefits still be friends without? Leonard and Penny try hanging out alone, while Sheldon must overcome his fear of birds.

Sheldon becomes jealous and considers taking his relationship with Amy to the next level when Stuart from the comic book store asks her out on a date.

Forrest and Sheena get freaky. Elise confronts Nat. Lisa seeks cleansing. Stig surprises Aviva. Rick is given an ultimatum. Emma leaves Morocco.

Liz comes clean about her love life to Villa. Sophie shocks Pedro when she reveals she's going on a date. Kim jumps into an international romance.

Louis is covered in scaly skin that makes him feel like an alligator. Jennifer can't focus on her career due to a large unicorn-like lump on her forehead.

Half of Mary's body is a size 18 while the other is an 8. Anthony's cyst is in the area called the Triangle of Death, and Shane wants to get a lump off his back.

Joyce needs home health care and hasn't left the house in three years. When Dr. Now prescribes therapy, she must revisit an unhappy past with her mum.

I.Pnina. On the days that Kleinfeld is closed to the public, dress designer Pnina Tornai meets with VIP clients for exclusive appointments to discuss their dress dreams.

Tony Danza makes his debut at the salon to help his Broadway co-star find the perfect bridal costume for her role in their new musical, Honeymoon in Vegas.

Courtney said yes to Mark Zunino's sketch, but now it's time to try on the real gown. Jillian wants a fashion forward dress but her mother isn't making it easy.

The Sale Is On! Over 200 brides from, all over the country, queue for the Kleinfeld salon sale. Hundreds of dresses are up for grabs. But will everyone leave happy.

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.

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.

Georgie's jealousy rears its head when Mandy gets sent on an overnight work trip with boss, who also happens to be her ex.

Audrey and Mary's feud rears its head when Georgie needs their help with the tyre store, and Jim's forced to confront his age after visiting the DMV.

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.

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.

Sheldon hosts a visiting female physicist, but her intelligence seems matched by her libido.

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.

Howard uses a robotic arm for his own pleasure. Sheldon goes on a date with Amy Farrah Fowler, and Penny finds herself accompanying them.

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.

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.

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

Jerry! Jerry! Jerry! Producers and former guests reveal the dark stories of alleged abuse, incest, and deaths behind what was America's number 1 talk show.