"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.

"The Jiminy Conjecture"

Leonard and Penny try and make things not awkward after their hookup; Sheldon and Wolowitz bet their best comic books on a bet to determine the species of a cricket

TBBT Quotes

Mrs. Cooper: Shelly! I'm so glad you're here!
Sheldon: I saw you having naked sex.

Penny: I give up, he's impossible
Sheldon: I can't be impossible, I exist. I believe what you meant to say is, "I give up, he's improbable."