Series 5 Episode 16

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

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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