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The Bus Pants Utilization Scene
Watch The Big Bang Theory Season 4 Episode 12
"The Bus Pants Utilization"
Original Air Date:

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

As the Justice League
Watch The Big Bang Theory Season 4 Episode 11
"The Justice League Recombination"
Original Air Date:

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.

Penny, Bernadette and Amy
Watch The Big Bang Theory Season 4 Episode 10
"The Alien Parasite Hypothesis"
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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.

Keith Carradine on TBBT
Watch The Big Bang Theory Season 4 Episode 9
"The Boyfriend Complexity"
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Penny asks Leonard to fib to her father this week. Elsewhere, Howard, Raj and Bernadette go for an all-nighter with a telescope.

Return of Wil Wheaton
Watch The Big Bang Theory Season 4 Episode 8
"The 21-Second Excitation"
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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.

Pretty, Funny Guest Star
Watch The Big Bang Theory Season 4 Episode 7
"The Apology Insufficiency"
Original Air Date:

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

The Irish Pub Formulation Scene
Watch The Big Bang Theory Season 4 Episode 6
"The Irish Pub Formulation"
Original Air Date:

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

Amy with Sheldon
Watch The Big Bang Theory Season 4 Episode 5
"The Desperation Emanation"
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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.

Big Bang Guest Stars
Watch The Big Bang Theory Season 4 Episode 4
"The Hot Troll Deviation"
Original Air Date:

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

The Zazzy Substitution Scene
Watch The Big Bang Theory Season 4 Episode 3
"The Zazzy Substitution"
Original Air Date:

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

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TBBT Quotes

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

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