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Raj and Howard set up an online dating profile for Sheldon and find the perfect woman.

The Big Bang Theory

The Lunar Excitation

Leonard tells Penny about how he met Sheldon and what happened to the elevator.

The Staircase Implementation

Sheldon invites a famous physicist to the apartment, and competes with Leonard for her attention.

The Plimpton Stimulation

Sheldon goes to extremes to keep Leonard and Penny happy when they stop speaking to each other.

The Spaghetti Catalyst

Penny and Leonard have a fight that threatens their relationship; Sheldon and Wil Wheaton face off once again.

The Wheaton Recurrence

Sheldon's stage fright stands between him and a coveted award.

The Pants Alternative

When the guys buy a ring from "The Lord of the Rings" at a garage sale, the item threatens to tear them apart.

The Precious Fragmentation

Sheldon ends up in traffic court after getting a ticket because of Penny.

The Excelsior Acquisition

Leonard must choose who to bring with him when he goes to see the Large Hadron Collider on Valentine's Day.

The Large Hadron Collision

Sheldon tries to figure out the answer to a physics problem by working with Penny.

The Einstein Approximation

After their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.

The Bozeman Reaction

Sheldon and Koothrappali attend a university mixer; Leonard discovers that Penny believes in psychics.

The Psychic Vortex

Physicists and best friends Leonard and Sheldon learn about the social aspects of life through their relationships with the free-spirited beauty who moves in next door.

S3 E22 | The Staircase Implementation

E23 | The Lunar Excitation

E22 | The Staircase Implementation

E21 | The Plimpton Stimulation

E20 | The Spaghetti Catalyst

E19 | The Wheaton Recurrence

E18 | The Pants Alternative

E17 | The Precious Fragmentation

E16 | The Excelsior Acquisition

E15 | The Large Hadron Collision

E14 | The Einstein Approximation

E13 | The Bozeman Reaction

E12 | The Psychic Vortex