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Leonard sees Penny with another man and decides to cut his losses by going back to fellow scientist Leslie Winkle - a move that upsets Sheldon

Penny becomes addicted to an online game based on the world of Conan the Barbarian and keeps pestering Sheldon for advice

The walls close in on Mercedes as she races to get the money for her blackmailer. Dillon and Rex try to support Ste as he struggles with his emotions

Donny and Misbah's relationship is on the rocks, Frankie receives a threatening letter, and Mercedes wants to turn over a new leaf with her boyfriend Warren

Comedy clips showcasing amusing internet videos featuring sheep

Bart sees into his future with the help of a mysterious casino owner and it does not look bright. Lisa, however, seems destined for a stunning political career

Sheldon discovers his friends tampered with the Arctic expedition data, and Leonard gets frustrated as constant interruptions hamper his attempts to woo Penny

Sheldon and Howard stake their most coveted comic books on a bet over the species of a cricket. Jim Parsons and Simon Helberg star

Sheldon succeeds in getting Penny to conform to his standards, so Leonard adopts a similar strategy. Meanwhile, Howard and Raj meet two women at a goth nightclub

Raj accepts Sheldon's offer to work for him as he is desperate to avoid being sent back to India, and Howard starts spending more time with Leonard and Penny

Sheldon's opponent in a competition is his arch-enemy, Star Trek: The Next Generation actor Wil Wheaton. Meanwhile, Leonard asks Penny to set Howard up with one of her friends

Leonard worries his lack of American football knowledge is alienating him from Penny and her friends, but finds an unlikely sporting tutor in the form of Sheldon

Leonard argues with Penny when one of her male friends stays over and further rows break out between the friends, much to Sheldon's annoyance. Johnny Galecki stars

Penny injures herself in the shower while Leonard, Raj and Howard are on a camping trip, leaving Sheldon to come to her rescue. Jim Parsons stars

Howard's fear of commitment causes him to avoid Bernadette, and Kripke plays a prank on Sheldon during a radio interview. Johnny Galecki and Simon Helberg star

Bernadette shows an interest in Leonard's physics experiment, making Howard so jealous that she threatens to end their relationship. Melissa Rauch and Simon Helberg star

Leonard's mother visits and he is horrified to learn that Sheldon knows more than he does about his own family. Guest starring Christine Baranski

Raj lusts after a girl he and Sheldon meet at a university party, and Leonard comes to regret airing his disapproval of Penny's belief in psychics

Leonard and Sheldon's flat is burgled, so they work on a state-of-the-art security system in a bid to outwit any future would-be thieves

Sheldon develops a mental block and has difficulty working on a formula, so he takes a job at a diner to try to revive his creativity - much to Penny's disapproval

Leonard is invited to visit the Large Hadron Collider in Switzerland and asks Penny to join him as a Valentine's Day treat, leaving Sheldon deflated

Sheldon misses an opportunity to meet Spider-Man co-creator Stan Lee when he has to go to court for a driving offence, and his subsequent anger leads to his imprisonment

The friends fight over a ring they believe was used in the Lord of the Rings film trilogy, with Raj wishing to sell it and Sheldon becoming obsessed with the object

Sheldon is awarded a prestigious prize by the university and worries about the speech he will have to give at the ceremony, so Penny and Raj try to build up his confidence

Leonard tells Penny he loves her, but fails to get the desired response. Sheldon also finds himself competing against actor Wil Wheaton once again when the gang goes bowling

Sheldon tries to conceal his friendship with Penny from Leonard - but it does not take long for his deceit to be exposed. Comedy, starring Jim Parsons and Kaley Cuoco

Sheldon invites a famous physicist to the flat after befriending her online, but Penny has to confront Leonard when the visitor turns up in his bedroom. Guest starring Judy Greer

The comedy flashes back to reveal how Sheldon saved the lives of his pals, and looks at the origins of his friendship with Leonard, as well as explaining the housemates' agreement

Raj and Howard register Sheldon with an online dating site hoping to find his perfect woman, while Penny gets drunk and seduces Leonard

Christmas festivities are in full swing in the village, as Warren and Mercedes look forward to the future and Frankie confides in Dodger

Bart discovers a hidden musical talent and quickly becomes an acclaimed jazz drummer - making Lisa envious of his success. With the voices of the White Stripes

Ellie Goulding, Mawaan Rizwan, Sophie Morgan and Tracy-Ann Oberman make jam roly-poly and a biscuit honouring their celebrity hero - all in the name of charity

The armchair critics share their opinions on shows including Strictly Come Dancing, Victoria Beckham, Slow Horses, Antiques Roadshow and Eva Longoria: Searching for Spain

Two familiar faces return and are hell bent on reclaiming their connections. The daters engage in a steamy reverse strip tease. Dating show hosted by Rylan Clark

A six-foot-tall pansexual opera singer is looking for a man as tall as she is, while a woman with a disastrous dating history hopes to bring out her naughty side

Penny and Leonard try to distract Sheldon from his career woes by reinstating Anything Can Happen Thursday, and Raj prepares for a date with Emily

The friends are saddened by the news that Professor Proton has died - just as they are making their final preparations for Star Wars Day. Bob Newark guest stars

The restaurant hosts a festive party as maitre d' Fred and his Christmas Cupids celebrate a year that has seen proposals, engagement rings and the show's very first baby

Erica is at a crossroads about her future, so she draws inspiration from Baby Boom and crafts a plan to 'have it all'. Adam remakes the Uptown Girl music video

Bart faces a tough test at school when he gets a new teacher who seems to want to crush his spirit, while the family attends a community festival

Homer finds himself caught in the throes of a midlife crisis, so he takes up bass guitar and forms a band with some of the other dads in Springfield

Phil is determined to finally scare Claire on Halloween, while Gloria feels self-conscious about her age for the first time when someone correctly assumes she is Jay's wife

Gloria takes the whole family to a mountain cabin for a picture-perfect white Christmas, but unhelpful weather and a random eccentric guest conspire to ruin the festive cheer

Jay struggles with the age gap between the parents of Joe's latest play date, Cam tries to act as matchmaker for Lily, and Haley, Alex and Luke run into Goodfellas star Ray Liotta

Sheldon discovers his friends tampered with the Arctic expedition data, and Leonard gets frustrated as constant interruptions hamper his attempts to woo Penny