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Hannah is no longer sure she wants the huge princess gown she dreamed of as a child. And, Lisa turns up to the boutique with her fiancé.

Sheldon gets an odd request from an old friend, while George and Mary are caught in the middle of Meemaw and Dale's breakup.

While Sheldon copes with the death of a hero, Georgie struggles with his big secret, and Missy wants to babysit.

George and Mary insist on meeting the new woman in Georgie's life, while Sheldon and Missy have suspicions about what's going on with their family.

Despite the whole family trying to keep it a secret, Sheldon and Missy learn about Georgie's pregnancy.

With the Coopers facing judgement from the congregation in the wake of Georgie's pregnancy, Sheldon is distracted by the family drama.

Sheldon struggles with the first signs of puberty while his parents hunt for new jobs, and Georgie and Meemaw take a business trip across the border.

Nine-year-old Sheldon learns that his high intelligence isn't always helpful growing up in East Texas, where church and football are king.

To appease his worried mother, Sheldon employs the techniques of a self-help book to try and make a friend.

Leonard and Howard engineer a distraction for Sheldon to keep him from hindering progress on the guidance-system project.

Amy is incensed when she learns Sheldon has shared intimate relationship information, and Raj's father stops sending financial support.

Raj finds himself in a cash crunch and turns to Sheldon to help him. Meanwhile, Penny considers crashing the guys' annual Comic-Con getaway.

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.

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.

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

Dr. Lee meets Stephanie, who has a giant baseball-sized scalp bump. Plus, Wesley believes that a pencil lead is embedded in his palm.

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.