While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon’s perfect match online.

Leonard tells Penny about how he met Sheldon for the first time

Leonard and Sheldon compete for the attention of a famous female physicist.

When Leonard and Penny aren’t speaking, Sheldon goes to extremes to keep them both happy.

A fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.

Sheldon’s fear of speaking in public threatens his ability to accept an award.

When the guys find an actual ring from the “Lord of the Rings” trilogy at a garage sale, their friendship is threatened.

Sheldon winds up in traffic court when he gets a ticket because of Penny.

Leonard faces a dilemma in choosing between Sheldon or Penny to accompany him to Switzerland to see CERN’s Large Hadron Collider on Valentine’s Day.

Sheldon begs Penny to let him work

A robbery of their apartment sees Leonard and Sheldon call on their friends to devise a security system.

Episode Summary : Leonard’s mother makes a visit to his dismay and Sheldon’s delight.
Episode Name : The Big Bang Theory  Season 03 Episode 11 – The Maternal Congruence
Aired: 14 December 2009

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Episode Summary : Sheldon attempts to help Penny understand physics to impress Leonard, and Wolowitz becomes jealous when his new girlfriend takes an interest in Leonard’s research.
Episode Name : The Big Bang Theory  Season 03 Episode 10 – The Athens Recurrence
Aired: 7 December 2009

Episode Summary : Sheldon vows payback after Kripke humiliates him on the radio. Howard gets advice concerning his relationship with Bernadette…from “Battlestar Galactica’s” Katee Sackhoff.
Episode Name : The Big Bang Theory  Season 03 Episode 09 – The Vengeance Formulation
Aired: 23 November 2009

Episode Summary : Penny separates her shoulder in the bathtub, and is forced to turn to Sheldon for help. Meanwhile, the rest of the guys accidentally get stoned in the desert while waiting for a meteor shower
Episode Name : The Big Bang Theory  Season 03 Episode 08 – The Adhesive Duck Deficiency
Aired: 16 November 2009

Episode Summary : Leonard and Penny’s first night together goes awkwardly. Sheldon and Howard wager on the species of a cricket.

Episode Name : The Big Bang Theory  Season 03 Episode 07 - The Guitarist Amplification
Aired:11 September 2009

Episode Summary : To blend in better with several of Penny’s friends from back home, Leonard learns about football…from Sheldon. Meanwhile, a loss in a kite war threatens to end Raj and Howard’s friendship.
Episode Name : The Big Bang Theory  Season 03 Episode 06 - The Cornhusker Vortex
Aired: 2 November 2009

Episode Summary :Wolowitz begs Penny to set him up with one of her friends; Sheldon seeks payback against Wil Wheaton at a trading-card show.
Episode Name : The Big Bang Theory  Season 03 Episode 05 - The Creepy Candy Coating Corollary
Aired: 19 October 2009

Episode Summary : Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard and Penny dealing with Howard as third wheel.
Episode Name : The Big Bang Theory  Season 03 Episode 04 - The Pirate Solution
Aired: 12 October 2009

Episode Summary : Sheldon attempts to covertly alter Penny’s habits, while Howard and Raj try their luck meeting women at a Goth-style club.
Episode Name : The Big Bang Theory  Season 03 Episode 03 – The Gothowitz Deviation
Aired: 5 October 2009

Episode Summary : Leonard and Penny’s first night together goes awkwardly. Sheldon and Howard wager on the species of a cricket.
Episode Name : The Big Bang Theory  Season 03 Episode 02 – The Jiminy Conjecture
Aired: 28 September 2009

Episode Summary : After returning from the North Pole, a conflict among the guys sends Sheldon back to Texas and interferes with Leonard’s reunion with Penny.
Episode Name : The Big Bang Theory  Season 03 Episode 01 The Electric Can Opener Fluctuation
Aired:  21 September 2009

“The Big Bang Theory S03 E12 – The Psychic Vortex”

Episode Summary : Leonard is aghast to find out a secret of Penny’s: she believes in psychics. Meanwhile, Sheldon tries to assist Koothrappali in picking up a girl at a university party.