The Big Bang Theory

Penny struggles with Leonard's confession that he kissed another woman as they prepare to get married in Las Vegas. Meanwhile, Sheldon doesn't know what to do after Amy pushes pause on their relationship.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

Leonard and Penny try to work through their marital issues. Meanwhile, Sheldon films a special episode of "Fun with Flags" after his breakup with Amy, and Bernadette feels guilty about withholding a secret from Penny.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Jim Reynolds

The guys's skills are put to the test when they get a flat tire on the way to Mexico for Leonard's bachelor party. The girls throw Penny a mini-bachelorette party.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

An impending change to his living arrangements inspires Sheldon to revert to 2003, before he met Penny and Leonard. Raj and Howard form a band for the comic book store.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

Kripke expresses interest in Amy while leading a fencing lesson for the guys. Meanwhile, Stuart seeks help from the girls in getting more women interested in the comic book store.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

Leonard and Sheldon go to great lengths to secure the helium they need during a nation-wide shortage. Meanwhile, the rest of the gang try to find Amy a new boyfriend on a dating app.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

While being interviewed for a documentary about Spock from Star Trek (1966), Sheldon struggles to suppress his emotions about his recent break-up from Amy. Meanwhile, Howard and Bernadette butt heads over renovating his mother's h...

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Nikki Lorre
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

Sheldon, Howard and Raj post an ad online to find a new girlfriend for Sheldon. Penny and Bernadette decide to spy when Amy is secretive about who she is dating.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steve Holland

On Thanksgiving, Sheldon and Amy try to spend time together as friends and go to an aquarium, Howard reluctantly agrees to volunteer at the soup kitchen with Bernadette, Raj and Emily, and Penny discovers that Leonard knows more about her than she thought.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steve Holland

Sheldon has a revelation when he realizes why a song was stuck in his head. Meanwhile, Amy invites Dave over for dinner despite their previously awkward date, and Howard and Raj become obsessed with a fan of their band.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

Leonard, Howard and Raj have to decide who will take their extra Star Wars movie ticket, while Sheldon plans something special for Amy's birthday.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steve Holland

Penny gets more than she bargained for when Leonard agrees to meet with a psychiatrist on her behalf to make a sale. Meanwhile, Sheldon and Raj collaborate on an astronomical discovery, and Howard and Bernadette's happiness is short-lived after Stuart moves out.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

After being forced to deal with a sick Sheldon, the rest of the gang try to treat themselves to a Sheldon-free weekend.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

Sheldon is thrilled when his Meemaw comes to visit, but his excitement quickly fades when she butts heads with Amy. Meanwhile, Raj meets a girl at the comic book store who makes him question his relationship with Emily.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

Sheldon and Amy host a Valentine's Day episode of "Fun with Flags", Leonard and Penny grapple with getting older, Howard and Bernadette find a surprise in their hot tub and Raj is torn between Emily and Claire.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steve Holland

Bernadette reveals her pregnancy to Howard and the rest of the gang.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

The gang convinces Sheldon to celebrate his birthday and throw him a party.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

Leonard, Sheldon, and Howard run into problems when they file for a patent for their infinite persistence gyroscope. Meanwhile, the girls give Raj dating advice when Emily reaches out to him after their breakup.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steve Holland

Amy is shocked at a revelation from Sheldon after she buys him a new laptop. Meanwhile, Raj sells out Leonard and Howard after they lie to their wives in order to attend an early screening of a movie.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

Secrets are revealed when Amy and Sheldon join Penny and Leonard on a weekend cabin trip. Raj is more excited about Howard's and Bernadette's impending parenthood than they are.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

The gang pick sides when a small argument between Leonard and Sheldon erupts into a heated fight during a "Game of Thrones" viewing party.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

Sheldon and Bernadette spend the evening together while the rest of the gang go to a wine tasting party, but things get uncomfortable for Raj when Penny's ex-boyfriend Zack shows up and takes an interest in Claire.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Nikki Lorre
Writer(s): Chuck Lorre, Bill Prady, Steve Holland

Sheldon hires Stuart to spend the day with Amy when he would rather go to the movies. Meanwhile, Penny struggles to make a connection with Leonard's mother when she comes to visit.

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Anthony Rich
Writer(s): Chuck Lorre, Bill Prady, Steven Molaro

Leonard and Penny try to have a wedding ceremony that everyone can attend, but it creates serious conflict among Sheldon's mother and Leonard's divorced parents. Meanwhile, Howard and Raj become convinced the government is out to ...

Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco
Director(s): Mark Cendrowski
Writer(s): Chuck Lorre, Bill Prady, Steve Holland