"The Bozeman Reaction"

When Leonard and Sheldon's apartment gets robbed, their friends help them devise a security system.

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"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

TBBT Quotes

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.

Sheldon: Nothing more fun than a paradigm shifting evening of science.
Penny: (to Leonard) And you thought it was soaping me up in the shower.