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The Big Bang Theory

    • Episode 23 - The Lunar Excitation

      Raj registers Sheldon for online dating and finds the perfect match: the female version of Sheldon. Penny seduces Leonard while she's drunk.

    • Episode 22 - The Staircase Implementation

      This episode flashes back to the start of Sheldon and Leonard's friendship seven years previously and explains the housemate agreement

    • Episode 21 - The Plimpton Stimulation

      Sheldon meets a famous physicist online and invites her over to the flat, where she spends her time flirting with Leonard

    • Episode 20 - The Spaghetti Catalyst

      Sheldon hides his friendship with Penny from Leonard but his cover is soon blown. Can he remain friends with both Penny and Leonard?

    • Episode 19 - The Wheaton Recurrence

      Leonard tells Penny that he loves her. The gang go bowling and find that Sheldon's enemy Wil Wheaton is playing in the opposing team.

    • Episode 18 - The Pants Alternative

      Sheldon earns a prestigious prize but is scared of collecting the award at a ceremony because he knows he'll have to make a speech

    • Episode 17 - The Precious Fragmentation

      The gang squabble over a ring that they believe was used in The Lord of the Rings movies, while Sheldon seems to be turning into Gollum

    • Episode 16 - The Excelsior Acquisition

      Sheldon is summoned to court for driving through a red light. He misses the chance to meet Stan Lee and riles the judge. Will he go to prison?

    • Episode 15 - The Large Hadron Collision

      Sheldon is gutted when Leonard asks Penny to go to Switzerland to see the world's largest particle accelerator instead of him

    • Episode 14 - The Einstein Approximation

      Sheldon is baffled by a formula he's working on, so he gets a less mentally taxing job at the Cheesecake Factory to kick-start his creativity

    • Episode 13 - The Bozeman Reaction

      Leonard and Sheldon's flat is burgled. Determined to outwit any thieves, the gang work on creating a state-of-the-art security system to protect the apartment. Can they deter the burglars?

    • Episode 12 - The Psychic Vortex

      Sheldon and Raj go to a university party, Leonard disapproves of Penny's belief in psychics, and Raj lusts after a girl called Abby

    • Episode 11 - The Maternal Congruence

      Leonard is horrified when his mother turns up unannounced, and then he finds out that Sheldon knew about the visit

    • Episode 10 - The Gorilla Experiment

      Penny feels left out when Bernadette asks Sheldon to teach her about science. And Howard is jealous when Bernadette asks Leonard about his work.

    • Episode 9 - The Vengeance Formulation

      Howard is scared about committing to Bernadette so he avoids her. Then he realises he's made a mistake and, to compensate, he proposes to her.

    • Episode 8 - The Adhesive Duck Deficiency

      Leonard, Raj and Howard go on a camping trip that alters their minds. Sheldon has to come to Penny's rescue after she dislocates her shoulder when she slips in the shower.

    • Episode 7 - The Guitarist Amplification

      Sheldon is upset when Leonard and Penny argue about Penny's male friend staying over and he has to act as peacemaker

    • Episode 6 - The Cornhusker Vortex

      Sheldon teaches Leonard about football so that he can fit in with Penny's friends, but Leonard alienates the group with his new knowledge

    • Episode 5 - The Creepy Candy Corollary

      Sheldon enters a competition that pits him against Star Trek actor Wil Wheaton, whom Sheldon considers his arch-enemy after he snubbed him as a child at a Star Trek convention

    • Episode 4 - The Pirate Solution

      Raj reluctantly accepts a job offer from Sheldon so that he won't be sent back to India. Leonard and Penny try to get some time for themselves.

    • Episode 3 - The Gothowitz Deviation

      Sheldon rewards Penny with chocolate to modify her behaviour, while Howard and Raj go to a goth nightclub

    • Episode 2 - The Jiminy Conjecture

      Leonard and Penny feel awkward around each other after their romantic liaison, while Sheldon and Howard take bets to determine a species of cricket

    • Episode 1 - The Electric Can Opener Fluctuation

      Leonard's attempts to woo Penny are constantly thwarted, while Sheldon heads to Texas after learning that his friends meddled with his expedition data