The Big Bang Theory

Created by writer/producers Chuck Lorre (of Two and a Half Men) and Bill Prady (of Gilmore Girls) comes The Big Bang Theory, a sitcom that shows what happens when hyperintelligent roommates/physicists Sheldon and Leonard meet Penny, a beautiful woman moving in next door--and realize they know next to nothing about life outside of the lab. Rounding out the crew are the smarmy Wolowitz, who thinks he's as sexy as he is brainy, and Koothrappali, who suffers from an inability to speak in the presence of a woman. The show distinguishes itself by being unafraid to toss scientific references and technobabble into an otherwise standard sitcom, even employing a physicist to keep things accurate. In doing so, it allows Sheldon and Leonard to do for science what Frasier's Crane brothers did for fine dining, art, and opera.

Season 4

Episode Twelve

The Bus Pants Utilization
Leonard's idea for a smartphone app derails his friendship with Sheldon.

Episode Eleven

The Justice League Recombination
The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.

Episode Ten

The Alien Parasite Hypothesis
Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.

Episode Nine

The Boyfriend Complexity
Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.

Episode Eight

The 21-Second Excitation
While the guys camp in line for a screening, Penny and Bernadette invite Amy to her first slumber party.

Episode Seven

The Apology Insufficiency
Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.

Episode Six

The Irish Pub Formulation
Leonard keeps an affair secret from Sheldon, Howard and Raj.

Episode Five

The Desperation Emanation
Leonard realizes he's the only one without a girlfriend, while Sheldon wants to get rid of his.

Episode Four

The Hot Troll Deviation
An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.

Episode Three

The Zazzy Substitution
The guys are concerned as Sheldon searches for an alternative to human companionship.

Episode Two

The Cruciferous Vegetable Amplification
Sheldon realizes he won't live long enough to download his consciousness into a robot body, and attempts to extend his lifespan.

Episode One

The Robotic Manipulation
Penny finds herself along for the ride on Sheldon's first date ever; while Wolowitz finds a new use for a robotic arm.