The Big Bang Theory
Series 4 Episode 3

The guys are concerned when a heartbroken Sheldon starts bulk-buying cats after he breaks up with Amy. Leonard realises he must get Sheldon's mother to visit.

The Robotic Manipulation: Penny tags along on Sheldon's first ever date. Howard finds a new use for a robotic arm.

First shown: Thu 4 Nov 2010 | 21 mins

The Cruciferous Vegetable Amplification: Sheldon realises he won't live long enough to download his consciousness into a robot body

First shown: Thu 11 Nov 2010 | 20 mins

The Zazzy Substitution: Sheldon starts bulk-buying cats after breaking up with Amy

First shown: Thu 18 Nov 2010 | 21 mins

The Hot Troll Deviation: An embarrassing secret of Howard's comes to light as he tries to win back Bernadette

First shown: Thu 25 Nov 2010 | 19 mins

The Desperation Emanation: Leonard realises that he's the only one of the gang without a girlfriend

First shown: Thu 2 Dec 2010 | 20 mins

The Irish Pub Formulation: A visit from Raj's sister Priya creates tension among the guys

First shown: Thu 9 Dec 2010 | 21 mins

The Apology Insufficiency: Leonard vows to be more confident around attractive women. Howard has a call from the FBI.

First shown: Thu 16 Dec 2010 | 21 mins

The 21-Second Excitation: Wil Wheaton scuppers Sheldon's movie-going plans

First shown: Thu 23 Dec 2010 | 18 mins

The Boyfriend Complexity: Leonard discovers that Penny's parents still think that he and Penny are a couple

First shown: Thu 30 Dec 2010 | 20 mins

The Alien Parasite Hypothesis: Amy discovers that she has feelings for Penny's ex-boyfriend Zack

First shown: Thu 6 Jan 2011 | 19 mins