Season 3
Worlds collide in Season 3! A love affair with Penny has opened a big, wide, wonderful world of romance for Leonard. But Sheldon likes the world just the way it was, thank you. All of which makes for a zany comic triangle with brainy, clueless Sheldon and practical, grounded Penny hilariously vying for the role of hypotenuse.
Episodes
1 The Electric Can Opener Fluctuation Sep 21, 2009 
2 The Jiminy Conjecture Sep 28, 2009 
3 The Gothowitz Deviation Oct 5, 2009 
4 The Pirate Solution Oct 12, 2009 
5 The Creepy Candy Coating Corollary Oct 19, 2009 
6 The Cornhusker Vortex Nov 2, 2009 
7 The Guitarist Amplification Nov 9, 2009 
8 The Adhesive Duck Deficiency Nov 16, 2009 
9 The Vengeance Formulation Nov 23, 2009 
10 The Gorilla Experiment Dec 7, 2009 
11 The Maternal Congruence Dec 14, 2009 
12 The Psychic Vortex Jan 11, 2010 
13 The Bozeman Reaction Jan 18, 2010 
14 The Einstein Approximation Feb 1, 2010 
15 The Large Hadron Collision Feb 8, 2010 
16 The Excelsior Acquisition Mar 1, 2010 
17 The Precious Fragmentation Mar 8, 2010 
18 The Pants Alternative Mar 22, 2010 
19 The Wheaton Recurrence Apr 12, 2010 
20 The Spaghetti Catalyst May 3, 2010 
21 The Plimpton Stimulation May 10, 2010 
22 The Staircase Implementation May 17, 2010 
23 The Lunar Excitation May 24, 2010