"The Thespian Catalyst"

Sheldon gets acting lessons from Penny on this episode. Elsewhere, Koothrappali fantasizes about his best friend's gal.

  • 3.5 / 5.0
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"The Love Car Displacement"

There's tension at a hotel this week. That's because the group runs into Bernadette's ex-boyfriend during a science event.

  • 4.0 / 5.0
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"The Bus Pants Utilization"

Leonard gets an idea for a smart phone application on this episode. How does that go? Find out now.

  • 3.5 / 5.0
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"The Justice League Recombination"

The guys find a use for Penny's boyfriend this week, as they enter a costume contest and they go as the Justice League members.

  • 4.5 / 5.0
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"The Alien Parasite Hypothesis"

Amy realizes she has sexual feelings for Penny's ex on this episode. That's awkward. Meanwhile, Koothrappali and Wolowitz attempt to prove who would be the better superhero.

  • 4.0 / 5.0
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"The Boyfriend Complexity"

Penny asks Leonard to fib to her father this week. Elsewhere, Howard, Raj and Bernadette go for an all-nighter with a telescope.

  • 4.0 / 5.0
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"The 21-Second Excitation"

Wil Wheaton is back this week! He causes problems for the guys when they try to see a movie. Elsewhere, Penny and Bernadette invite Amy to a sleepover.

  • 3.0 / 5.0
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"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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TBBT Quotes

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

Penny: What actor holds the record for being named People magazine's Sexiest Man Alive?
Sheldon: William Shatner!
Leonard: I don't think it's Shatner.
Sheldon: Then it's got to be Patrick Stewart