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Leonard, Sheldon and Wolowitz celebrate the completion of their top-secret military project, until an unpleasant surprise leaves their heads spinning.

Sheldon's former admirer, Dr. Ramona Nowitzki, turns up while Amy is visiting Princeton, and the gang is extremely concerned.

What did she say? Amy answers Sheldon's marriage proposal. Meanwhile, Howard and Bernadette struggle with some unexpected news.

Dara Ó Briain hosts hilarious chat and games with guests Rhys James, Angela Barnes, Alasdair Beckett-King, Ria Lina, Sean McLoughlin and Mark Simmons.

A teenager trying to find her place in the world discovers and repairs a battle-scarred robot, who's disguised as a Volkswagen Beetle.

After attending Aunt Ginny's funeral, Frankie fears that the family is missing out on important life milestones and vows to begin celebrating them.

With Indiana hosting the Super Bowl, Frankie is devastated when she volunteers to help and ends up with a less-than-stellar position.

Frankie and Mike decide to try a fresh approach to Valentine's Day by having dinner out with friends. Brick is tasked with writing a report on love.

Belinda's lump on her neck causes her to be immobile. Nicole won't get married until she gets her arm pit lump removed. And, Nick unwisely removed a lipoma at home.

Dominic's life is falling apart due to his food addiction. At over 600-lbs, living in a van with his brother, he is leaving California to meet Dr. Now in Texas.

Indecisive bride Jacqueline has a challenge for Randy. Plus, a hip-hop medium is on the hunt for the perfect black dress for her special day.

After attending Aunt Ginny's funeral, Frankie fears that the family is missing out on important life milestones and vows to begin celebrating them.

With Indiana hosting the Super Bowl, Frankie is devastated when she volunteers to help and ends up with a less-than-stellar position.

Frankie and Mike decide to try a fresh approach to Valentine's Day by having dinner out with friends. Brick is tasked with writing a report on love.

Sheldon interviews with a school for gifted children. Much to their surprise, the rest of the family struggle with his absence.

A worried Mary sends Sheldon to Sunday school after she finds him playing Dungeons & Dragons with Tam and Billy.

Sheldon asking for a computer has unforeseen consequences for his parents, prompting Mary and the twins to move in with Meemaw.

Leonard and Penny offer Sheldon's old room to Raj after he moves out of his apartment.

Raj moves in with Leonard and Penny, and a period of adjustment begins, while usually self-centred Sheldon shows surprising interest in Amy's work.

Sheldon is pushing himself with too many collaborations. Bernadette's maternity leave is running out, and she must face going back to work.

Leaving the baby in daycare proves to be tough for Bernadette, and geologist Bert digs up a girlfriend, but some colleagues think she's a gold digger.

Leonard isn't thrilled when Penny considers taking a new job offered by her ex-boyfriend, Zack.

Leonard, Sheldon and Wolowitz celebrate the completion of their top-secret military project, until an unpleasant surprise leaves their heads spinning.

Sheldon's former admirer, Dr. Ramona Nowitzki, turns up while Amy is visiting Princeton, and the gang is extremely concerned.

What did she say? Amy answers Sheldon's marriage proposal. Meanwhile, Howard and Bernadette struggle with some unexpected news.

Frankie tries very hard to get an excited Sue tickets to a Justin Bieber concert. Mike is thrilled over Brick's enthusiasm to win a spelling bee.

The kids call a meeting with Frankie and Mike, accusing them of being a nag and giving out crazy punishments without hearing their sides of the story.

This year is a leap year, and Sue's birthday falls on February 29, so she is excited about celebrating her big day in a big way.

Sheldon's germophobia lands him in detention when flu season hits Medford and he takes extreme measures to remain healthy.

When Mary takes a job at the church, Sheldon and Missy are left home alone for the very first time.

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.

Leonard's job is at stake when he gives an embarrassing radio interview which angers the university and the entire physics community.

Amy tries to convince Sheldon that he has a more laid-back side, meanwhile, Raj and Stuart compete to win the heart of Bernadette's new co-worker.

Wolowitz and Sheldon bond over their relationships with their disappointing fathers. And Leonard's mum finds a new best friend in Penny.

Sheldon and Raj confide in Bernadette when they can't handle Amy and Howard working together. Penny and Leonard learn new ways to deal with Sheldon.

Sheldon goes head-to-head with Wil Wheaton. Penny takes care of Halley when Bernadette and Howard are both on bed rest.

Sheldon and Bert collaborate on a research project, while Penny and Bernadette coach Koothrappali on how to navigate his relationship with Ruchi.

Leonard and Howard learn Sheldon went to work with the military. Bernadette suspects Ruchi is trying to steal her job.

The guys cut Sheldon out of a potentially valuable Bitcoin investment. Also, an old video reveals a secret about Leonard and Penny's relationship.

The huge cyst on the back of Carol's head is agony. Plus, 19-year-old Alfie's acne has scarred his back and chest. Bill has a concerning lump on his neck.

Elesha suffers with soreness in her intimate areas. Lucinda's vaginal skin tears apart. Stewart's desperate to be rid of the lumps on his scrotum.

The Curious Case Of The Pooting Cyst. Diane has thousands of tumours all over her body that have ruined her life. Plus, Will is worried his shoulder lump will be ripped open at work.

Frankie tries very hard to get an excited Sue tickets to a Justin Bieber concert. Mike is thrilled over Brick's enthusiasm to win a spelling bee.

The kids call a meeting with Frankie and Mike, accusing them of being a nag and giving out crazy punishments without hearing their sides of the story.

This year is a leap year, and Sue's birthday falls on February 29, so she is excited about celebrating her big day in a big way.

The large bump at the base of Taylor's spine is more dangerous than she realizes. John has an embarrassing hip lump, and Noelle wants her stretched ears repaired.

At 24 years old and over 600-lbs, Megan lives at home with her mum. Now, Megan must travel to Houston to meet Dr. Now and change her eating habits.

Lacie wants a glittery princess dress with the 'wow' factor - will it work for a hot Cyprus wedding? Debra seeks a sexy mermaid-style frock to renew her vows.

Whose Side Are You On? Michaella is getting married in an Irish castle and wants a princess dress for her big day. And, fashionista Shavonne has a high-style reputation to maintain.

Frankie tries very hard to get an excited Sue tickets to a Justin Bieber concert. Mike is thrilled over Brick's enthusiasm to win a spelling bee.

The kids call a meeting with Frankie and Mike, accusing them of being a nag and giving out crazy punishments without hearing their sides of the story.

This year is a leap year, and Sue's birthday falls on February 29, so she is excited about celebrating her big day in a big way.

Sheldon's germophobia lands him in detention when flu season hits Medford and he takes extreme measures to remain healthy.

When Mary takes a job at the church, Sheldon and Missy are left home alone for the very first time.

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.

Leonard's job is at stake when he gives an embarrassing radio interview which angers the university and the entire physics community.

Amy tries to convince Sheldon that he has a more laid-back side, meanwhile, Raj and Stuart compete to win the heart of Bernadette's new co-worker.

Wolowitz and Sheldon bond over their relationships with their disappointing fathers. And Leonard's mum finds a new best friend in Penny.

Sheldon and Raj confide in Bernadette when they can't handle Amy and Howard working together. Penny and Leonard learn new ways to deal with Sheldon.

Sheldon goes head-to-head with Wil Wheaton. Penny takes care of Halley when Bernadette and Howard are both on bed rest.

Sheldon and Bert collaborate on a research project, while Penny and Bernadette coach Koothrappali on how to navigate his relationship with Ruchi.

Leonard and Howard learn Sheldon went to work with the military. Bernadette suspects Ruchi is trying to steal her job.

The guys cut Sheldon out of a potentially valuable Bitcoin investment. Also, an old video reveals a secret about Leonard and Penny's relationship.

Brick takes a job as a newspaper delivery boy from the town's veteran newsman in order to buy himself night vision goggles.

When the Hecks attend a new church, Frankie is inspired by the pastor's sermon about getting business in life completed before dying.

Sue finds a kindred spirit in her awkward school guidance counsellor, Jane Marsh, who inspires her to reinvent herself as Suki.

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.

Sheldon and Amy try to eliminate stress from wedding planning using maths. Raj realises his best friend is actually hurting his confidence.

Sheldon and Howard plan birthday celebrations for Amy and Halley. Leonard spirals out about his lack of accomplishments.

Sheldon and Amy subject their friends to a series of experiments to choose the best man and maid of honour. And Penny reveals her true feelings.

Amy and Leonard bond during a series of experiments. Bert replaces Howard in Footprints on the Moon, and Sheldon finds Penny a source of inspiration.

Raj learns the woman he's dating has a very upset husband. Sheldon rents his old room for a quiet place to work.

Wil Wheaton offers Amy a role on the new 'Professor Proton Show,' and Penny thinks the female protagonist in Leonard's novel is based on her.

All Bernadette's friends try different tactics to get labour started. Amy accidentally reveals she's already chosen their son's name.

Leonard tries to secure the perfect wedding venue for Sheldon and Amy. Bernadette and Howard have a hard time deciding who should go back to work.

In Brazil, Claudio lives with a condition that bent his head backward. In Norway, Birgitte lives with a different presentation of the same condition.

Chan's medical mystery could take her eyesight. Erin and Jack are tested by a life-changing accident. Nicole mysteriously codes on the delivery table.

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.