"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

"The Electric Can Opener Fluctuation"

Sheldon runs to his mother when he learns the gang messed with her arctice expedition's data; the guys go chasing after him with Leonard sacrificing his chance with Penny.

"The Monopolar Expedition"

When Sheldon gets news he's going to the North Pole on a NSF expedition, he invites the guys as his group.

"The Classified Materials Turbulence"

Howard enlists the help of the boys in order to fix his space toilet. Stuart and Penny go on their second date.

TBBT Quotes

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

Leonard: Hi. I'm Leonard. You are beautiful. You pop, sparkle and buzz electric. I'm going to pick you up at eight, show you a night you will never forget.
Raj: Where are we going?