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S3 E21 — The Plimpton Stimulation Sheldon meets a famous physicist online and invites her over to the flat. Once there, she flirts with Leonard and pays a visit to him in his bedroom. Penny finds out and confronts Leonard. Meanwhile, Sheldon is irked that Leonard is showing interest in his friend.

S9 E18 — Thank You for Not Kissing Dr Fulton calls Frankie and Mike into his office to inform them that Brick and Cindy have been making out all over school. Sue attempts to work up the courage to tell Sean how much she likes him.

S9 E19 — Bat Out of Heck Axl is fed up with Mike telling him how to run his life, Sue is determined to win a prestigious hotel scholarship and Frankie sees something flying through the house.

S9 E20 — Great Heckspectations Frankie forces Brick to ask Cindy to the prom. Lexie talks a clueless Axl into giving Sue a belated 21st birthday present. Mike is frustrated by a new TV remote.

S3 E9 — A Party Invitation, Football Grapes and an Earth Chicken Mary gets Pastor Jeff involved when Sheldon isn't invited to Billy's birthday party, and George and Dr Sturgis bond.

S3 E10 — Teenager Soup and a Little Ball of Fib Sheldon fakes being sick to avoid a swim test at school. Meanwhile, Dr Sturgis spies on Meemaw's new boyfriend.

S3 E11 — A Live Chicken, a Fried Chicken and Holy Matrimony George Sr. and Meemaw struggle to manage the Cooper household while Mary plans Pastor Jeff's wedding.

S3 E22 — The Staircase Implementation This episode flashes back to the start of Sheldon and Leonard's friendship seven years previously and explains the housemate agreement and how Sheldon saved the lives of his friends.

S3 E23 — The Lunar Excitation Raj and Howard register Sheldon for online dating and find the perfect woman, and Penny seduces Leonard while she's drunk but regrets it the next day. Will Leonard regret their encounter?

S4 E1 — The Robotic Manipulation Penny tags along to Sheldon's first ever date with a woman he's been texting for months. Meanwhile, Wolowitz finds a new use for a robotic arm.

S4 E2 — The Cruciferous Vegetable Amplification Sheldon realises he won't live long enough to download his consciousness into a robot body, so he attempts to extend his lifespan. Meanwhile, the gang bump into Apple co-founder Steve Wozniak at The Cheesecake Factory.

S4 E3 — The Zazzy Substitution The guys are concerned when Sheldon searches for an alternative to human companionship after he and Amy break up. Can they help restore his faith in people? Meanwhile, when things take a turn for the worse and Sheldon starts bulk buying pet cats, Leonard gets Sheldon's mum to pay him a visit.

S4 E4 — The Hot Troll Deviation An embarrassing secret of Wolowitz's comes to light as he tries to win back his ex-girlfriend, Bernadette. Meanwhile, Sheldon and Raj have a small war at work.

S4 E5 — The Desperation Emanation Leonard realises that he's the only one of the gang without a girlfriend, while Sheldon wants to get rid of his when she hatches a plan for him to meet her mother.

S4 E6 — The Irish Pub Formulation An embarrassing secret of Wolowitz's comes to light as he tries to win back his ex-girlfriend, Bernadette. Meanwhile, Sheldon and Raj have a small war at work.