"The Apology Insufficiency"

Sheldon places Wolowitz's security clearance in danger this week. How so? By answering questions from an agent played by Eliza Dushku.

  • 3.8 / 5.0
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"The Irish Pub Formulation"

A major secret abounds this week, as Leonard keeps quiet about an affair with Raj's sister. Will Sheldon keep the secret?

  • 3.7 / 5.0
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"The Desperation Emanation"

Amy wants to introduce Sheldon to her mother on this episode. Meanwhile, Leonard is down on himself as he comes to terms with the fact that all the other guys have girlfriends.

  • 3.7 / 5.0
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"The Hot Troll Deviation"

We learn of an embarrassing secret about Wolowitz this week. How is that for a tease?!? Read our recap to learn more.

  • 3.7 / 5.0
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"The Zazzy Substitution"

The focus of this week's episode: Sheldon's search for an alternative to human companionship. Read on to see how that goes.

  • 3.5 / 5.0
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"The Cruciferous Vegetable Amplification"

By the time he downloads his consciousness into a robot body, Sheldon realizes he'll be long gone. As a result, he attempts to make himself live longer.

  • 3.5 / 5.0
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"The Robotic Manipulation"

Penny tags along for Sheldon's first date on the fourth season premiere. Elsewhere, Wolowitz discovers a new use for a robotic arm.

  • 3.5 / 5.0
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"The Lunar Excitation"

Blossom alert! Former sitcom star Mayim Bialik guest stars on the season finale as a potential love interest for Sheldon.

  • 4.0 / 5.0
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"The Staircase Implementation"

Leonard tells Penny the story of how the apartment elevator broke through a series of flashbacks.

  • 4.5 / 5.0
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"The Plimpton Stimulation"

Sheldon has a female physicist, Dr. Plimpton (Judy Greer) spend the night at the apartment.

  • 4.0 / 5.0
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TBBT Quotes

James Earl Jones: Why don't you and your friends come to Comic-Con with me?
Sheldon: Really?
James Earl Jones: Of course. And San Diego is right across the border from my favorite city on Earth, Tijuana.... where I'm taking you every night!
Sheldon: Ay-yi-yi.
James Earl Jones: Ay-yi-yi. Bang. Bang.

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.