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Leonard and Stephanie
Watch The Big Bang Theory Season 2 Episode 8
"The Lizard-Spock Expansion"
Original Air Date:

Wolowitz thinks he's found his soul mate, Dr. Stephanie Barnett (Sara Rue), until she meets Leonard. Wolowitz lets Stephanie drive the Mars rover, which gets stuck in a ditch.

Howard the Cable Guy
Watch The Big Bang Theory Season 2 Episode 7
"The Panty Piñata Polarization"
Original Air Date:

When Penny's cable goes out, she starts going over the guys' apartment to watch America's Next Top Model. However, after violating some of Sheldon's arbitrary rules, he bands her from coming over.

Sheldon and Romana
Watch The Big Bang Theory Season 2 Episode 6
"The Cooper-Nowitzki Theorem"
Original Air Date:

After an open house night at the University with grad students, an obsessive student Ramona Nowitzki (Riki Lindhome) likes Sheldon and makes her way into becoming his girlfriend / assistant.

Watch The Big Bang Theory Season 2 Episode 5
"The Euclid Alternative"
Original Air Date:

When Leonard needs to work the graveyard timeslot to gain access to the lasers for his experiment, Sheldon loses his ride to the university.

Watch The Big Bang Theory Season 2 Episode 4
"The Griffin Equivalency"
Original Air Date:

Raj is included in People's "30 under 30 to watch" list, prompting the rest of the group to be jealous.

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.

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TBBT Quotes

Penny, there's only one cookie with something in the middle that solves life's problems, and that's an Oreo. Or a Nutter Butter, if you're in a pinch.

Sheldon

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.