The Mommy Observation
Season 7, Ep. 18
Sheldon is faced with a new reality when he visits his mom in Houston; a murder mystery party starts arguments.
First aired: March 13, 2014
The Friendship Turbulence
Season 7, Ep. 17
Bernadette tries to negotiate peace between Sheldon and Wolowitz; Penny receives an embarrassing offer; Raj wants Amy to write to a woman on his behalf.
READ: The turbulence is both literal and figurative for Sheldon and Howard on 'Big Bang Theory'
First aired: March 6, 2014
The Table Polarization
Season 7, Ep. 16
When Leonard buys a dining room table, Sheldon re-evaluates the changes in his life; Bernadette is torn when Wolowitz gets the chance to go back to space.
First aired on February 27, 2014
The Locomotive Manipulation
Season 7, Ep. 15
Love is in the air when Amy convinces Sheldon to join her (as well as Howard and Bernadette) for a romantic weekend in Napa Valley to celebrate Valentine’s Day.
First aired on February 6, 2014
The Convention Conundrum
Season 7, Ep. 14
Unable to get Comic-Con tickets, Sheldon tries to hold his own convention and ends up spending a wild evening with James Earl Jones; the ladies try to act maturely.
First Aired: January 30, 2014
The Occupation Recalibration
Season 7, Ep. 13
Sheldon must learn how to relax when he is forced to take a vacation; Leonard tries to support Penny when she quits her job; Bernadette needs to replace one of Stuart's comic books.
First Aired: January 9, 2014
The Hesitation Ramification
Season 7, Ep. 12
As Leonard tries to help Penny with a disappointment, Penny asks him a bold question about their relationship; Sheldon wants to learn how to be funny.
First Aired: January 2, 2014
The Cooper Extraction
Season 7, Ep. 11
While Sheldon is in Texas, the rest of the gang realize how much he has changed their lives as they decorate the apartment Christmas tree.
First Aired: December 12, 2013
The Discovery Dissipation
Season 7, Ep. 10
Amy and Leonard try to help Sheldon deal with his shame; Raj stays with Bernadette and Howard for a week.
First Aired: December 5, 2013
The Thanksgiving Decoupling
Season 7, Ep. 9
When the gang decides to spend Thanksgiving at Mrs. Wolowitz's house, Sheldon protests; Leonard and Penny deal with an error from her past.
First Aired: November 21, 2013
The Itchy Brain Simulation
Season 7, Ep. 8
When a mistake comes to light, Sheldon makes Leonard walk a mile in his shoes; Penny decides to confront Raj's ex.
READ: It's Leonard vs. The Sweater of Red Death
First Aired: November 14, 2013
The Proton Displacement
Season 7, Ep. 7
When Professor Proton asks Leonard for help with an experiment, Sheldon retaliates by befriending Proton's rival, Bill Nye.
READ: It's Bill Nye the Science Guy vs. Professor Proton, played by Bob Newhart
First Aired: November 7, 2013
The Romance Resonance
Season 7, Ep. 6
Sheldon's latest scientific breakthrough leaves him feeling like a fraud; a romantic gesture between Howard and Bernadette causes Penny to up her game with Leonard.
First Aired: October 24, 2013
The Workplace Proximity
Season 7, Ep. 5
Sheldon and Amy's relationship is tested when she takes a job at his university; a fight with Bernadette leaves Howard sleeping on Raj's couch.
First Aired: October 17, 2013
The Raiders Minimization
Season 7, Ep. 4
Sheldon wants revenge after Amy ruins one of his favorite films; Leonard finds a way to get Penny to do anything; Stuart and Raj make online dating profiles.
Read more: 'Raiders of the Lost Ark' meets 'BBT' meets Sheldon's wrath
First aired: October 10, 2013
The Scavenger Vortex
Season 7, Ep. 3
Raj designs a scavenger hunt that brings out the best -- and the worst -- in the whole gang.
READ: Raj unleashes 'Big Bang' demons as he plans a scavenger hunt for the gang
First aired: Oct. 3, 2013
The Deception Verification
Season 7, Ep. 2
Sheldon and Penny share intimate secrets while Leonard is away at sea, later, Sheldon's feelings are crushed when Leonard returns. Meanwhile, Raj gets consoled about his ex-girlfriend and Wolowitz's relationship with his mother causes an unusual threat to his masculinity.
First Aired: Sept. 26, 2013
The Hofstadter Insufficiency
Season 7, Ep. 1
Sheldon and Penny share secrets while Leonard is away; Wolowitz helps Raj get over his ex.
READ: Season 7 premiere: Jealousy (no!) babies and trouble in paradise
First Aired: Sept. 26, 2013
The Bon Voyage Reaction (Finale)
Season 6, Ep. 24
When Leonard receives an exciting opportunity to work overseas, Penny and Sheldon are thrown for a loop.
'BBT' finale: Sheldon gets jealous over Leonard's new job, and it might not be happily-ever-after with Raj and Lucy 'Spock'-tacular: The cast can't get enough 'Star Trek' on 'BBT'
The Love Spell Potential
Season 6, Ep. 23
Amy and Sheldon's relationship takes a surprising turn during a game of "Dungeons & Dragons"; Lucy and Koothrappali have an awkward date.
Read more: Will Sheldon and Amy actually talk about that thing they've been avoiding?
Gallery: Love is in the air on 'BBT'
First Aired: May 9, 2013
The Proton Resurgence
Season 9, Ep. 22
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.
Read more: Sheldon meets his childhood idol on ‘Big Bang Theory’ but ends up riding with him to the hospital
First Aired: May 2, 2013
The Closure Alternative
Season 6, Ep. 21
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.
First Aired: April 25, 2013
The Tenure Turbulence
Season 6, Ep. 20
The girls get involved when Leonard, Sheldon and Raj compete for tenure at the University.
First Aired: April 4, 2013
The Closet Reconfiguration
Season 6, Ep. 19
Howard considers whether or not he should open a letter from his father; Penny and Leonard host a "grown-up" cocktail party.
Read more: You’re invited to a 'Big Bang Theory' dinner party
Read even more: Cast celebrates success of past 4 years, but withholds spoilers
First Aired: March 14, 2013
The Contractual Obligation Implementation
Season 6, Ep. 18
Leonard, Sheldon and Wolowitz talk to junior high girls about science-related careers; Raj plans a date with Lucy.
Read more: The guys head back to junior high, while Raj tries to sweep Lucy off her feet
Gallery: Forget the lab or the couch, the cast of 'BBT' hits the red carpet
First aired on March 7, 2013.