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Buying goods from the comfort of home

Sheldon makes friends with an upper-class senior pupil who introduces him to a new field of science. Meanwhile, Mary and George disagree on how to handle Sheldon's blossoming social life

A disappointing lack of success in a competition at the school science fair sends Sheldon's life in a new direction as he rejects the idea of becoming a scientist in favour of acting. Comedy, starring Iain Armitage

When Sheldon is bullied by an unlikely character, Mary and George disagree on how to handle the situation, contemplating whether they should their son employ self-defence techniques. Undeterred, he tries his hand at jiu-jitsu and even covers himself in bubble-wrap for protection

Leonard worries his lack of American football knowledge is alienating him from Penny and her friends. However, he finds an unlikely sporting tutor in the form of Sheldon, who reluctantly spent most of his childhood attending games with his father. Meanwhile, Raj is infuriated when Howard abandons him to pursue a girl at a kite-fighting contest

A jealous Leonard argues with Penny when she invites one of her male friends to stay at her apartment while he is in town. Unfortunately, the row brings up unpleasant memories for Sheldon of watching his warring parents, causing even more tension between the friends. Johnny Galecki, Kaley Cuoco and Jim Parsons star

Howard's fear of commitment causes him to avoid Bernadette, but he soon realises he has made a mistake and tries to compensate for it. Meanwhile, Kripke plays a prank during a radio interview with Sheldon, who sets out to get revenge, only to be caught by the Dean. Johnny Galecki, Simon Helberg and Kaley Cuoco star, with an appearance by Katee Sackhoff (Battlestar Galactica) as herself

Bernadette asks Leonard about his physics experiment, making Howard so jealous that she threatens to end their relationship. Penny also feels put out by the situation, and asks Sheldon to teach her about science. Johnny Galecki, Simon Helberg and Melissa Rauch star

Leonard's mother visits and he is horrified to learn that Sheldon knows more than he does about his own family, including his parents' impending divorce and the death of his dog. 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. Comedy, starring Kunal Nayyar and Jim Parsons

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. However, their plans go awry when they ensnare Penny in a net. Comedy, starring Johnny Galecki and Jim Parsons

Sheldon develops a mental block and has difficulty working on a formula, so in a move inspired by Albert Einstein he gets a job at the Cheesecake Factory diner to try to revive his creativity - and despite Penny's objections, proves surprisingly effective in the role. Guest starring Yeardley Smith (The voice of Lisa Simpson)

When Mary bans Sheldon from reading a comic book that she considers to be too mature for him, the youngster decides it's time to stop living under his mother's thumb

When Sheldon is no longer academically challenged at Medford High School, he audits a college class taught by his pen pal Dr John Sturgis. Wallace Shawn and Michael Cudlitz guest star alongside Iain Armitage

Leonard is invited to visit the Large Hadron Collider in Switzerland and asks Penny to join him as a Valentine's Day treat. However, Sheldon tries to persuade the couple to allow him to take her place

Sheldon misses an opportunity to meet Spider-Man co-creator Stan Lee when he has to go to court for driving through a red light, and his anger leads to his imprisonment. Penny finds out the address of the comic-book writer and takes Sheldon there - but his troubles with the law have yet to reach their conclusion and the visit does not go as expected