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With humanity facing extinction, it's up to Optimus Prime and the Autobots to save the world - but the government has turned against them.

Sheldon uses his new friendship with the school bully to boss Georgie around. Also, Missy steals Meemaw's makeup for Picture Day.

Sheldon and Dr. Sturgis have a fight when Dr. Sturgis marks a question wrong on Sheldon's test. Mary takes over for Pastor Jeff when he's out sick.

Bedridden for four years, Penny knows that her weight may kill her if drastic actions aren't taken. Penny hopes to have a gastric bypass before it's too late.

Gok faces a huge challenge when a pregnant bride reveals her tiny budget. Plus, Clare has lost four stone and has no idea what suits her new shape.

I've Stalked This Dress on Instagram! Designer Hayley Paige makes three one-of-a-kind dresses for her big day! And bride Elisabeth has one goal: to buy her dream Hayley Paige gown.

Things spiral out of control when Sheldon boycotts his favourite bread company. Georgie consoles Veronica when she's dumped by her boyfriend.

Inspired by his hero, Albert Einstein, Sheldon tries his hand at the violin. Also, Mary and Meemaw secretly buy a pregnancy test.

Sheldon moves in with Dr. Sturgis for the weekend to experience college life. A lonely Mary tries to bond with the other Coopers during his absence.

Unhappy that school funds are going toward football rather than academics, Sheldon decides to run for class president.

Georgie is thrilled when Veronica stays at the Coopers' for a few days. Meanwhile, Meemaw and Dr. Sturgis celebrate their one-year anniversary.

The Coopers help a broken-hearted Pastor Jeff through a rough patch in his marriage. Meanwhile, Sheldon pressures church members for donations.

A change in Sheldon's routine forces him to re-evaluate his entire life, when his barber is sick. Howard rethinks his decision to go into space.

Sheldon chooses to participate in a guys-only weekend Star Wars gaming marathon rather than go with Amy to her aunt's birthday party.

It's a dream come true for Sheldon when he has a close encounter with his hero, Mr. Spock -legendary sci-fi icon Leonard Nimoy.

When Wolowitz gets to work with world-renowned scientist, Stephen Hawking, Sheldon is willing to do anything to meet his hero.

Howard's wedding plans are in jeopardy after the guys throw him a bachelor party, and details of his sexual history are leaked online.

When NASA reschedules Howard's mission and puts his wedding plans in jeopardy, he's forced to face his fears - and Bernadette's dad.

When Howard and Bernadette decide they want to be married before his NASA space launch, the gang rushes to put on a wedding.

Howard discovers that he can't escape his mother - even in space! Back on earth, meanwhile, Raj turns his existence as a third wheel into an art form.

After learning Penny is thinking about breaking up with Leonard, Sheldon tries to intervene. Howard is being picked on in space by the astronauts.

While the pressure of being in space starts to take its toll on Howard, Amy feels threatened when Sheldon hires a young female assistant, Alex.

When Howard returns from space, he doesn't get the hero's welcome he expected. Meanwhile, Game Night turns into a battle of the sexes.

The gang celebrates Halloween at Stuart's comic book store. Leonard and Penny discover a new spark in their relationship with a scientific seduction.

Sheldon's friendship with renowned scientist Stephen Hawking is threatened by a game of 'Words with Friends.

Bernadette pressures Howard to move out of his mother's house. Sheldon finds himself caught in the middle of a fight between Amy and Wil Wheaton.

Howard and Raj try to understand why Sheldon disappears every afternoon at 2:45. Leonard and Penny wrestle with jealousy in their relationship.

When the University reassigns Sheldon's unused parking spot to Howard, the ensuing turf battle affects the whole gang.

Sheldon plays nursemaid to a sick Amy, while Howard attempts to bond with his father-in-law on an upcoming fishing trip.

Sheldon unwillingly revisits some Christmas memories during a lively game of Dungeons and Dragons, while Raj joins the girls for ladies' night out.

Sheldon is accused of sexual harassment at the University and winds up dragging Leonard, Raj and Howard into the fray.

Leonard's car is stolen when the guys take a road trip to a comic book convention in Bakersfield, dressed as Star Trek characters.

Mandy struggles to get Georgie's family to join him for his first Thanksgiving without his dad.

Georgie joins a church to sell tires to the congregation. Mandy worries there is more to the story than that.

Dara Ó Briain introduces topical chat and hilarious games with guests Rhys James, Ahir Shah, Angela Barnes, Sara Pascoe, Ed Byrne and Russell Howard.

Armed with no knowledge but plenty of passion, comedian Guz Khan begins his mission to modify a Honda S2000 into a dream custom car.