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'Bridezilla' Lucy has already lost two stone for her wedding, but the weight keeps dropping off! Can Jo, Al and seamstress, Marianna, make alterations in time.

Bride Karen has a wedding dress emergency when the dress she ordered from Australia doesn't turn up! Can Jo and Al think up a solution with four weeks to go.

Karen's mum wants to get her daughter into her wedding dress, but can't seem to get it right! A last minute dress panic sees Jo and Al come to the rescue.

Bride Zara wants to sparkle - but having never worn a dress before, she's out of her comfort zone. The pressure is on for Jo and Al to make her feel like a lady.

Sheldon visits CalTech for the first time. Meanwhile, Georgie is furious when Mary listens in on a phone call with his girlfriend.

Sheldon accuses Dr. Sturgis of plagiarism. Georgie has an awkward run-in with Veronica while on a date with his new girlfriend, Jana.

When George Sr. accidentally lands the school librarian in the hospital, the Cooper family look after her. Meemaw gives Georgie relationship advice.

When Sheldon learns the house next door is for sale, he looks for the perfect neighbours. Missy pitches against her boyfriend at the baseball game.

Sheldon has a scientific breakthrough at the dentist. Dale and Meemaw go to the casino. Georgie makes a mistake when he's left in charge of the store.

Sheldon discovers that Mary's been keeping a secret about his future. Also, Meemaw is furious when she learns that Dale fired Georgie.

Mandy makes a controversial remark on live TV that puts her job, Georgie's business, and the family's reputation at risk.

Mandy struggles to celebrate Georgie's 21st birthday after hitting a rough patch in her career.

Leonard and Sheldon consider dropping by George Lucas' Skywalker Ranch when a speaking engagement puts them nearby.

Sheldon and Amy reach a crossroad, a man claiming to be Wolowitz's half-brother shows up, and Penny and Leonard argue live on Wil Wheaton's podcast.

NASA asks Raj to craft a message for aliens in the event of contact, and Penny must choose between an audition or her job in pharmaceutical sales.

Wolowitz and Sheldon can't get a drone to fly, Leonard nearly misses giving a commencement address, and Raj pits his parents against each other.

Leonard and Sheldon's mothers come to town to celebrate their sons getting an award, but the opinionated women engage in an altercation over religion.

Leonard and Penny are pressured to set a wedding date by Sheldon, whose relationship with Amy has taken an interesting turn.

Penny has a problem dealing with Leonard's confession about having kissed another woman, while Sheldon is confused about Amy calling a time out.

To ease Penny's mind, Leonard pays a visit to the woman he kissed during his expedition to the North Sea. Sheldon's breakup leads him to retaliate.

The guys surprise Leonard with a belated bachelor-party weekend in Mexico, but their plans hit a bump in the road when they get a flat tire.

Sheldon reverts to 2003 when he learns that Leonard and Penny are moving in together, while Howard and Raj form a band to play at the comic store.

When Barry Kripke gives the guys fencing lessons, he makes a point of letting Sheldon know he's interested in dating Amy.

A helium shortage leads Sheldon and Leonard to do business with a dealer in the black market to acquire some of the element for an experiment.

Sheldon's interview for a 'Star Trek' documentary focusing on Spock turns up a shocking revelation about his breakup with Amy.

When Leonard, Penny and Bernadette learn that Amy is going out on a dinner date, the trio set out to spy on her and the guy.

Sheldon and Amy spend Thanksgiving at the aquarium, Wolowitz volunteers at a soup kitchen, and Penny realises that Leonard knows a lot about her.

God only knows what song is constantly playing in Sheldon's head, but it reminds him of Amy and leads to a surprising revelation.

Professor Proton visits Sheldon in a dream and gives him Obi-Wan-like advice about whether to go see the new Star Wars film or spend time with Amy.

Penny entices Leonard to meet with a psychiatrist, Stuart moves out of the Wolowitz house, and Howard and Bernadette find themselves at a loss.

Dealing with an under-the-weather Sheldon is draining for Penny, Leonard and the gang so they decide to treat themselves to a Sheldon-less weekend.

Sheldon's Meemaw visits and there's friction between her and Amy, which intensifies after the elderly woman blurts out a secret about Sheldon.

Mike's religious beliefs have kept him from seeing a doctor about his huge growth. Plus, Kylie debates whether to remove her birthmark.

Erica stabbed her hand with a pencil 45 years ago and believes the lead remains trapped in her palm. Paula's swollen feet emit a foul odour.