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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.