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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.

Sheldon and His Cousin
Watch The Big Bang Theory Season 1 Episode 10
"The Loobenfeld Decay"
Original Air Date:

When Penny is given a part in Rent, the boys try to avoid to see her show after hearing her sing "Out Tonight" out of key in order to not hurt her feelings.

TBBT Quotes

Howard: Attention people of Earth: Tonight, there will be two moons in the sky.

Sheldon: Why do you have the Chinese character for "soup" tattooed on your right buttock?
Penny: It's not "soup," it's "courage."
Sheldon: No it isn't. But I suppose it does take courage to demonstrate that kind of commitment to soup.
Penny: How'd you see it? You said you wouldn't look.
Sheldon: Sorry. As I told you, the hero always peeks.

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