Leonard and Sheldon's geeky world is rocked to its core when the gorgeous Penny moves in across the hall. Unlike Sheldon, Leonard takes an immediate shine to her. But what will she make of them?
Series 1 Episode 1
Pilot: Leonard and Sheldon's geeky world is shaken up by the arrival of a new neighbour
Series 1 Episode 2
The Big Bran Hypothesis: Sheldon sneaks into Penny's apartment to tidy it, but she's not pleased
Series 1 Episode 3
The Fuzzyboots Corollary: Leonard summons up the courage to ask a woman out on a date
Series 1 Episode 4
The Luminous Fish Effect: Getting fired leaves Sheldon pondering life beyond physics
Series 1 Episode 5
The Hamburger Postulate: Sheldon is uncomfortable with a change to his hamburger routine
Series 1 Episode 6
The Middle Earth Paradigm: Penny's Halloween party puts the gang's social skills to the test
Series 1 Episode 7
The Dumpling Paradox: Penny needs somewhere to sleep when Howard spends the night in her flat with her friend
Series 1 Episode 8
The Grasshopper Experiment: Raj discovers that he can talk to women when he's had a few drinks
Series 1 Episode 9
The Cooper-Hofstadter Polarization: Sheldon's reluctance to share credit on joint work causes a rift between him and Leonard
Series 1 Episode 10
The Loobenfeld Decay: Sheldon lies to get out of seeing Penny perform on stage. But one lie leads to another...