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The Big Bang Theory

    • Episode 1 - The Skank Reflex Analysis

      Penny worries that she's screwed things up with her friends after her night with Raj. Meanwhile Sheldon takes command of the paintball team.

    • Episode 2 - The Infestation Hypothesis

      A battle of wills between Sheldon and Penny leaves Amy in the middle. Leonard tries to spice up his long-distance relationship with Priya.

    • Episode 3 - The Pulled Groin Extrapolation

      Leonard goes as Amy's date to a colleague's wedding. Howard tries to convince Bernadette to live with his mum after they get married.

    • Episode 4 - The Wiggly Finger Catalyst

      Raj is upset that he's the only one of the four guys not in a relationship, so Penny sets out to find him the perfect date.

    • Episode 5 - The Russian Rocket Reaction

      Sheldon's old nemesis Wil Wheaton returns and invites everyone to a housewarming party. Sheldon threatens to 'de-friend' Leonard if he goes.

    • Episode 6 - The Rhinitis Revelation

      Sheldon's mum visits and soon becomes a firm favourite with his friends, much to Sheldon's annoyance.

    • Episode 7 - The Good Guy Fluctuation

      Leonard questions his feelings for Priya when he kisses a girl he meets in the comic book store.

    • Episode 8 - The Isolation Permutation

      Amy is heartbroken when she finds out that Penny and Bernadette have been shopping for bridesmaids dresses without her.

    • Episode 9 - The Ornithophobia Diffusion

      Leonard and Penny attempt to hang out without anybody else around, while Sheldon faces his fear of birds.

    • Episode 10 - The Flaming Spittoon Acquisition

      Stuart from the comic book shop asks Amy out on a date. In jealousy, Sheldon asks her to be his girlfriend.

    • Episode 11 - The Speckerman Recurrence

      Leonard confronts the man who bullied him in high school, while Penny realises she did her fair share of tormenting in the past.

    • Episode 12 - The Shiny Trinket Maneuver

      When Sheldon is dismissive of Amy's career, Penny, Raj and Leonard teach him that sometimes it's a good idea to pretend to care about things

    • Episode 13 - The Recombination Hypothesis

      In the 100th episode of the US sitcom, Leonard and Penny agree to give their relationship another chance, but they soon start to argue again

    • Episode 14 - The Beta Test Initiation

      Leonard and Penny put their relationship through a 'beta test' and report problems they have with each other as 'bugs', while Sheldon and Amy seek internet fame

    • Episode 15 - The Friendship Contraction

      After Sheldon keeps him awake all night, an irate Leonard decides that he needs to break the roommate agreement, which formally ends their friendship

    • Episode 16 - The Vacation Solution

      Sheldon helps Amy in her biology lab after he is forced to use up two weeks of holiday, but he is bored by the tasks she gives him

    • Episode 17 - The Rothman Disintegration

      Sheldon and Kripke argue over who should get Professor Rothman's vacant corner office. Amy buys Penny some art to celebrate their friendship.

    • Episode 18 - The Werewolf Transformation

      Sheldon's well-organised world is turned upside down when he learns that the barber who has cut his hair for years is ill in hospital

    • Episode 19 - The Weekend Vortex

      Amy is upset when Sheldon breaks his promise to accompany her to her aunt's birthday party in order to join the guys for a video game marathon

    • Episode 20 - The Transporter Malfunction

      Penny buys Leonard and Sheldon some Star Trek memorabilia but she is irked when they refuse to remove the toys from their packaging

    • Episode 21 - The Hawking Excitation

      When Stephen Hawking comes to lecture at the university, Howard is given the task of maintaining his wheelchair, making Sheldon green with envy

    • Episode 22 - The Stag Convergence

      Leonard, Sheldon and Raj throw a bachelor party for Howard, during which some stories about his sexual history are accidentally revealed

    • Episode 23 - The Launch Acceleration

      When Nasa inform Howard that his space mission has been rescheduled to an earlier date, he tries to use the wedding as an excuse not to go

    • Episode 24 - The Countdown Reflection

      In the last episode of season five, Bernadette decides that she wants to get married to Howard before his Nasa space mission

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