"The Psychic Vortex"

Sheldon and Raj attend a university mixer where Raj meets Abby (Danica McKellar); Leonard is upset to find out that Penny believes in psychics.

"The Maternal Congruence"

Leonard's mother, Beverly (Christine Baranski), is back and Leonard is upset to find out she's getting divorced and told Sheldon, not him.

"The Gorilla Experiment"

Penny seeks Sheldon's help to better understand Leonard's work; Wolowitz gets jealous when Leonard and Bernadette become friends.

"The Vengeance Formulation"

When Kripke embarrasses Sheldon on NPR, he swears revenge; Wolowitz is scared to commit to Bernadette.

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"The Adhesive Duck Deficiency"

When Leonard, Raj and Wolowitz go camping, an injured Penny must rely on Sheldon for help.

"The Guitarist Amplification"

When Penny's musician ex-boyfriend wants to crash on her couch, Leonard and Penny fight and Sheldon tries to stop them.

"The Cornhusker Vortex"

Leonard gets tutored in football by Sheldon; a kite flying mishap causes a fight between Wolowitz and Raj

"The Creepy Candy Coating Corollary"

Sheldon goes up again the Star Trek actor, Wil Wheaton; Wolowitz wants Penny to set him up with one of her friends

"The Pirate Solution"

Desperate to avoid going back to India, Raj considers a job working for Sheldon; Howard becomes a third wheel to Leonard and Penny

"The Gothowitz Deviation"

Howard takes Raj with him to the Goth dating scene; Sheldon uses chocolate as part of his behavioral experiment on Penny.

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: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.