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Series 1 Episode 2

Sheldon is bothered by how messy Penny's flat is, so sneaks in to clean and organise it. When Penny finds out, she isn't best pleased.

Pilot: Leonard and Sheldon's geeky world is shaken up by the arrival of a new neighbour

First shown: Thu 14 Feb 2008 | 22 mins

Series 1 Episode 1

The Big Bran Hypothesis: Sheldon sneaks into Penny's apartment to tidy it, but she's not pleased

First shown: Wed 20 Feb 2008 | 20 mins

Series 1 Episode 2

The Fuzzyboots Corollary: Leonard summons up the courage to ask a woman out on a date

First shown: Wed 27 Feb 2008 | 21 mins

Series 1 Episode 3

The Luminous Fish Effect: Getting fired leaves Sheldon pondering life beyond physics

First shown: Wed 5 Mar 2008 | 20 mins

Series 1 Episode 4

The Hamburger Postulate: Sheldon is uncomfortable with a change to his hamburger routine

First shown: Wed 12 Mar 2008 | 19 mins

Series 1 Episode 5

The Middle Earth Paradigm: Penny's Halloween party puts the gang's social skills to the test

First shown: Wed 19 Mar 2008 | 20 mins

Series 1 Episode 6

The Dumpling Paradox: Penny needs somewhere to sleep when Howard spends the night in her flat with her friend

First shown: Wed 26 Mar 2008 | 20 mins

Series 1 Episode 7

The Grasshopper Experiment: Raj discovers that he can talk to women when he's had a few drinks

First shown: Wed 2 Apr 2008 | 19 mins

Series 1 Episode 8

The Cooper-Hofstadter Polarization: Sheldon's reluctance to share credit on joint work causes a rift between him and Leonard

First shown: Wed 9 Apr 2008 | 19 mins

Series 1 Episode 9

The Loobenfeld Decay: Sheldon lies to get out of seeing Penny perform on stage. But one lie leads to another...

First shown: Wed 16 Apr 2008 | 20 mins

Series 1 Episode 10

The Pancake Batter Anomaly: Penny makes the mistake of volunteering to look after Sheldon when he's sick

First shown: Wed 23 Apr 2008 | 21 mins

Series 1 Episode 11

The Jerusalem Duality: Sheldon's shaken when he meets a teenage physicist who is clearly much brighter than he is

First shown: Wed 30 Apr 2008 | 19 mins

Series 1 Episode 12

The Bat Jar Conjecture: Sheldon is ousted from the gang's Physics Bowl quiz team, so he forms a rival team

First shown: Wed 7 May 2008 | 20 mins

Series 1 Episode 13

The Nerdvana Annihilation: Leonard considers giving up his habit of collecting memorabilia when Penny makes fun of it

First shown: Wed 14 May 2008 | 19 mins

Series 1 Episode 14

The Shiksa Indeterminacy: Leonard, Howard and Raj compete for the attention of Sheldon's stunning twin sister

First shown: Wed 21 May 2008 | 21 mins

Series 1 Episode 15

The Peanut Reaction: Penny plans a surprise party for Leonard, but things don't exactly go to plan

First shown: Wed 28 May 2008 | 19 mins

Series 1 Episode 16

The Tangerine Factor: Penny's break-up spurs Leonard to summon the courage to ask her out

First shown: Wed 4 Jun 2008 | 19 mins

Series 1 Episode 17

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