"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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"The Spaghetti Catalyst"

After Penny and Leonard break up, Sheldon goes behind Leonard's back to hang out with Penny.

TBBT Quotes

Leonard: You can't put that on Snapchat.
Raj: Fine, I'll put it on Facebook like a caveman.

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