Series 5 Episode 17

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

The Skank Reflex Analysis: Penny worries that she's screwed things up with her friends after her night with Raj

First shown: Thu 3 Nov 2011 | 21 mins

Series 5 Episode 1

The Infestation Hypothesis: A battle of wills between Sheldon and Penny leaves Amy in the middle

First shown: Thu 10 Nov 2011 | 19 mins

Series 5 Episode 2

The Pulled Groin Extrapolation: Leonard goes as Amy's date to a colleague's wedding

First shown: Thu 10 Nov 2011 | 19 mins

Series 5 Episode 3

The Wiggly Finger Catalyst: Raj is upset that he's not in a relationship, so Penny tries to find him the perfect date

First shown: Thu 17 Nov 2011 | 19 mins

Series 5 Episode 4

The Russian Rocket Reaction: Sheldon's old nemesis Wil Wheaton returns and invites everyone to a house-warming party

First shown: Thu 24 Nov 2011 | 21 mins

Series 5 Episode 5

The Rhinitis Revelation: Sheldon's mum becomes a firm favourite with his friends - much to Sheldon's annoyance

First shown: Thu 1 Dec 2011 | 21 mins

Series 5 Episode 6

The Good Guy Fluctuation: The gang play Halloween pranks on Sheldon. Leonard questions his feelings for Priya.

First shown: Thu 8 Dec 2011 | 19 mins

Series 5 Episode 7

The Isolation Permutation: Amy learns that Penny and Bernadette have been shopping for bridesmaids gowns without her

First shown: Thu 15 Dec 2011 | 20 mins

Series 5 Episode 8

The Ornithophobia Diffusion: Leonard and Penny attempt to hang out without anybody else around

First shown: Thu 22 Dec 2011 | 20 mins

Series 5 Episode 9

The Flaming Spittoon Acquisition: Stuart from the comic book shop asks Amy out, so Sheldon asks her to be his girlfriend

First shown: Thu 29 Dec 2011 | 20 mins

Series 5 Episode 10

The Speckerman Recurrence: Leonard confronts the man who bullied him in high school

First shown: Thu 5 Jan 2012 | 19 mins

Series 5 Episode 11

The Shiny Trinket Maneuver: Sheldon's friends try to show him that sometimes it's good to pretend to care about things

First shown: Thu 29 Mar 2012 | 20 mins

Series 5 Episode 12

The Recombination Hypothesis: In the 100th episode, Leonard and Penny try to give their relationship another chance

First shown: Thu 5 Apr 2012 | 21 mins

Series 5 Episode 13

The Beta Test Initiation: Leonard and Penny give their relationship a beta test. Sheldon and Amy seek internet fame.

First shown: Thu 5 Apr 2012 | 20 mins

Series 5 Episode 14

The Friendship Contraction: Leonard decides he needs to break the roommate agreement

First shown: Thu 12 Apr 2012 | 20 mins

Series 5 Episode 15

The Vacation Solution: When Sheldon's told he has to take holiday, he helps Amy in her biology lab

First shown: Thu 19 Apr 2012 | 21 mins

Series 5 Episode 16

The Rothman Disintegration: Amy buys Penny some art to celebrate their friendship

First shown: Thu 19 Apr 2012 | 20 mins

Series 5 Episode 17

The Werewolf Transformation: Sheldon's meticulously organised world is turned upside down when his barber is taken ill

First shown: Thu 26 Apr 2012 | 20 mins

Series 5 Episode 18

The Weekend Vortex: Amy is upset when Sheldon breaks his promise to accompany her to her aunt's birthday party

First shown: Thu 3 May 2012 | 19 mins

Series 5 Episode 19

The Transporter Malfunction: Penny buys Star Trek memorabilia for Leonard and Sheldon but they won't open the packaging

First shown: Thu 10 May 2012 | 21 mins

Series 5 Episode 20

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