E1 - The Date Night Variable

Aired: September 27, 2012

With his friends on dates, Raj must face his loneliness. Also, Wolowitz is caught in an argument between Bernadette and his mom, even while he’s in space.

E2 - The Decoupling Fluctuation

Aired: October 04, 2012

When Sheldon learns that Penny is thinking about breaking up with Leonard, he tries to intervene. Meanwhile, in space, the other astronauts pick on Howard.

E3 - The Higgs Boson Observation

Aired: October 11, 2012

Amy feels threatened when Sheldon hires a young female assistant, and the pressure of being in space takes its toll on Wolowitz.

E4 - The Re-Entry Minimization

Aired: October 18, 2012

When Wolowitz returns from space, he doesn’t get the hero’s welcome he expected. Meanwhile, Game Night turns into a battle of the sexes.

E5 - The Holographic Excitation

Aired: October 25, 2012

The gang celebrates Halloween at Stuart’s comic book store. Meanwhile, Leonard seduces Penny with science.

E6 - The Extract Obliteration

Aired: November 01, 2012

Sheldon’s relationship with Stephen Hawking is threatened over a game of “Words with Friends,” and Penny secretly enrolls in a class at the local college.

E7 - The Habitation Configuration

Aired: November 08, 2012

Wolowitz struggles with moving out of his mother’s house. Meanwhile, Sheldon is caught in the middle of an argument between Amy and Wil Wheaton.

E8 - The 43 Peculiarity

Aired: November 15, 2012

Raj and Howard try to to figure out why Sheldon disappears at 2:45 every afternoon; jealousy arises in Penny and Leonard's relationship.

E9 - The Parking Spot Escalation

Aired: November 29, 2012

When the University reassigns Sheldon’s parking spot to Wolowitz, their fight affects the whole gang.

E10 - The Fish Guts Displacement

Aired: December 06, 2012

When Amy gets sick, Sheldon tries to nurse her back to health; Wolowitz and his father-in-law plan a fishing trip.

E11 - The Santa Simulation

Aired: December 13, 2012

During a Dungeons and Dragons game, Sheldon revisits Christmas memories; Amy, Penny and Bernadette look for a date for Raj.

E12 - The Egg Salad Equivalency

Aired: January 03, 2013

When Sheldon is accused of sexual harassment, he ends up getting Raj, Leonard and Howard in trouble.

E13 - The Bakersfield Expedition

Aired: January 10, 2013

As the guys don costumes and go on a road trip to a comic book convention, the ladies decide to stay home and try to interpret a comic book.

E14 - The Cooper/Kripke Inversion

Aired: January 31, 2013

Sheldon faces a crisis of confidence when he is forced to work with his nemesis, Barry Kripke; Raj and Howard buy expensive action figures of themselves.

E15 - The Spoiler Alert Segmentation

Aired: February 07, 2013

A fight between Sheldon and Leonard impacts Amy and Penny's living arrangements; while Howard is away, Raj helps Mrs. Wolowitz out.

E16 - The Tangible Affection Proof

Aired: February 14, 2013

The guys search for a perfect Valentine's Day gift for their significant others; Stuart and Raj host a "lonely people" party at the comic book store.

E17 - The Monster Isolation

Aired: February 21, 2013

After a bad date, Koothrappali decides to never leave his apartment; Penny's acting skills impress Sheldon.

E18 - The Contractual Obligation Implementation

Aired: March 07, 2013

Leonard, Sheldon and Howard give lectures on science to junior high students. The girls ditch work to go to Disneyland. Raj devises a date for Lucy that fixes their social anxiety problems.

E19 - The Closet Reconfiguration

Aired: March 14, 2013

Howard considers whether or not he should open a letter from his father; Penny and Leonard host a "grown-up" cocktail party.

E20 - The Tenure Turbulence

Aired: April 04, 2013

The girls get involved when Leonard, Sheldon and Raj compete for tenure at the University.

E21 - The Closure Alternative

Aired: April 25, 2013

Amy tries to help Sheldon get over his compulsive need for closure when one of his favorite TV shows is canceled; Raj discovers a secret about Lucy.

E22 - The Proton Resurgence

Aired: May 02, 2013

Leonard and Sheldon hire the host (Bob Newhart) of their favorite childhood TV show to perform; Bernadette and Howard run into trouble while dog-sitting for Raj's pet.

E23 - The Love Spell Potential

Aired: May 09, 2013

A date between Raj and Lucy takes both of them out of their comfort zones. After a trip to Las Vegas goes awry, the girls join in on a Dungeons and Dragons game, which causes Amy and Sheldon to re-evaluate their relationship.

E24 - The Bon Voyage Reaction

Aired: May 16, 2013

When Leonard receives an exciting opportunity to work overseas, Penny and Sheldon are thrown for a loop. Raj and Lucy's relationship comes to a crossroad.