Series 2 Episode 10

Leonard goes to Penny for help when his relationship with Stephanie takes off faster than he'd like. But will he choose to act on her advice?

The Bad Fish Paradigm: Penny opens up to a reluctant Sheldon after a less-than-stellar first date with Leonard

First shown: Wed 19 Nov 2008 | 21 mins

Series 2 Episode 1

The Codpiece Topology: When he sees Penny out on a date with another guy, Leonard rushes back to Leslie Winkle

First shown: Wed 19 Nov 2008 | 20 mins

Series 2 Episode 2

The Barbarian Sublimation: When Penny becomes addicted to an online game, she persistently pesters Sheldon for advice

First shown: Wed 26 Nov 2008 | 20 mins

Series 2 Episode 3

The Griffin Equivalency: Raj becomes massively arrogant when he's named in People Magazine's '30 to Watch Under 30'

First shown: Wed 26 Nov 2008 | 20 mins

Series 2 Episode 4

The Euclid Alternative: Sheldon's friends stage an intervention to overcome his fear of driving

First shown: Wed 3 Dec 2008 | 19 mins

Series 2 Episode 5

The Cooper-Nowitzki Theorem: Sheldon struggles to cope with a student's unexpected devotion to him

First shown: Wed 3 Dec 2008 | 20 mins

Series 2 Episode 6

The Panty Piñata Polarization: After Sheldon bans Penny from the apartment, she retaliates with a devious plan

First shown: Wed 10 Dec 2008 | 20 mins

Series 2 Episode 7

The Lizard-Spock Expansion: A woman who Howard has a major crush on falls for Leonard

First shown: Wed 10 Dec 2008 | 19 mins

Series 2 Episode 8

The White Asparagus Triangulation: Sheldon is delighted that Leonard finally has a girlfriend matching his high standards

First shown: Wed 17 Dec 2008 | 20 mins

Series 2 Episode 9

The Vartabedian Conundrum: Leonard asks Penny for advice when his relationship with Stephanie takes off too quickly

First shown: Wed 17 Dec 2008 | 20 mins

Series 2 Episode 10

The Bath Item Gift Hypothesis: At Christmas, Sheldon's obsession with gift-giving etiquette torments his friends

First shown: Thu 26 Mar 2009 | 20 mins

Series 2 Episode 11

The Killer Robot Instability: Kripke challenges the boys to a robot duel

First shown: Thu 2 Apr 2009 | 20 mins

Series 2 Episode 12

The Friendship Algorithm: Sheldon develops a scientific procedure for making friends

First shown: Thu 9 Apr 2009 | 21 mins

Series 2 Episode 13

The Financial Permeability: When Sheldon lends Penny some money, it brings her ex-boyfriend Kurt back into her life

First shown: Thu 16 Apr 2009 | 21 mins

Series 2 Episode 14

The Maternal Capacitance: A disastrous visit from Leonard's mother has an unexpected side-effect

First shown: Thu 23 Apr 2009 | 20 mins

Series 2 Episode 15

The Cushion Saturation: Penny accidentally shoots one of Sheldon's cushions during a game of paintball

First shown: Thu 30 Apr 2009 | 20 mins

Series 2 Episode 16

The Terminator Decoupling: The boys discover that beautiful sci-fi actress Summer Glau is on the same train as them

First shown: Thu 7 May 2009 | 20 mins

Series 2 Episode 17

The Work Song Nanocluster: Sheldon gets involved in Penny's home-based business selling hair accessories

First shown: Thu 14 May 2009 | 20 mins

Series 2 Episode 18

The Dead Hooker Juxtaposition: Penny develops a rivalry with an attractive new neighbour

First shown: Thu 21 May 2009 | 20 mins

Series 2 Episode 19

The Hofstadter Isotope: Leonard is devastated when Stuart from the comic book shop chats Penny up

First shown: Thu 28 May 2009 | 19 mins

Series 2 Episode 20

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