The Big Bang Theory

Thursdays 8:00 PM on CBS
The big bang theory
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Watch The Big Bang Theory Season 2 Episode 3
"The Barbarian Sublimation"
Original Air Date:

When Penny locks herself out of the apartment, she comes to hang out with Sheldon in his as he plays Age of Conan. Penny, frustrated by her recent failures in life soon plays and becomes addicted to Conan.

Leonard and Sheldon in Garb
Watch The Big Bang Theory Season 2 Episode 2
"The Codpiece Topology"
Original Air Date:

The guys return from the Renaissance fair and see Penny has already moved on to a new guy, Eric (Travis Schuldt), prompting Leonard to pursue a relationship with prior fling Leslie Winkle.

Penny and Leonard Return
Watch The Big Bang Theory Season 2 Episode 1
"The Bad Fish Paradigm"
Original Air Date:

Penny and Leonard return from their date from the end of season one and Leonard finds Howard and Raj spying on them via webcam.

Leonard and Penny About to Kiss
Watch The Big Bang Theory Season 1 Episode 17
"The Tangerine Factor"
Original Air Date:

Penny breaks up with her boyfriend after he posted intimate details about her on his blog. Leonard tries to comfort her but accidentally sends her back into the arms of her boyfriend.

Wolowitz Distracts Leonard
Watch The Big Bang Theory Season 1 Episode 16
"The Peanut Reaction"
Original Air Date:

When the boys go to eat at Penny's restaurant, she learns Leonard has never had a birthday before. She decides to throw him a surprise party and blackmails Leonard into helping.

Leonard, Wolowitz and Missy
Watch The Big Bang Theory Season 1 Episode 15
"The Porkchop Indeterminacy"
Original Air Date:

The guys meet Sheldon's extremely attractive twin sister Missy (Courtney Henggeler) who is in town for a wedding.

The Boys Gather Round Leonard
Watch The Big Bang Theory Season 1 Episode 14
"The Nerdvana Annihilation"
Original Air Date:

Leonard buys a replica time machine online from the 1960 film The Time Machine and ends up splitting it with the guys.

Leslie and Leonard are PMS
Watch The Big Bang Theory Season 1 Episode 13
"The Bat Jar Conjecture"
Original Air Date:

The guys compete in a physics bowl after the previous contestants dropped out to form a barbershop quartet. When Sheldon's showboating becomes too much for them, they kick him off the team.

The Guys Meet Dennis Kim
Watch The Big Bang Theory Season 1 Episode 12
"The Jerusalem Duality"
Original Air Date:

Sheldon becomes insecure over his intelligence because of a smarter 15-year-old prodigy Dennis Kim. He decides his work is useless and he aims for the Nobel Peace Prize by creating a "Nuevo Jerusalem."

Penny Takes Care of Sheldon
Watch The Big Bang Theory Season 1 Episode 11
"The Pancake Batter Anomaly"
Original Air Date:

Penny returns from a visiting family in Nebraska with a cold causing Sheldon to freak out because he's a bit of a germaphone.

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TBBT Quotes

Penny: Here's a question-- as an alien pretending to be human, are you planning to engage in any post-prom mating rituals with Amy?
Sheldon: There are post-prom mating rituals?
Penny: Not always. Unless your date drives a van with an air mattress, then always.
Sheldon: Well, if it's part of the prom experience, then I'm open to it.
Penny: You're kidding.
Sheldon: I may be an alien, but I have urges.If Amy wants to copulate by firing her eggs into space, well, then, I will happily catch them with the reproductive sac on my upper flermin. I'm not the best at reading facial cues, but I can see that you're a little turned on.

Penny: I always tear up when the Grinch's heart grows three sizes.
Sheldon: Tears seem appropriate. Enlargement of the heart muscle, or hypertrophic cardiomyopathy, is a serious disease which can lead to congestive heart failure.