"The Infestation Hypothesis"

Amy is caught in the middle this week, as Sheldon and Penny fight. Leonard, meanwhile, tries to spice things up with Priya.

  • 4.5 / 5.0
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"The Skank Reflex Analysis"

The Big Bang Theory is back! On the premiere, the gang deals with Penny and Raj actually sleeping together.

  • 4.5 / 5.0
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"The Roommate Transmogrification"

Raj moves in with Sheldon on the fourth season finale of The Big Bang Theory. This takes Penny by surprise.

  • 4.0 / 5.0
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"The Engagement Reaction"

When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.

  • 3.0 / 5.0
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"The Wildebeest Implementation"

Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.

  • 4.0 / 5.0
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"The Agreement Dissection"

When Priya uses her lawyer skills to pick apart the roommate agreement, the girls take Sheldon dancing on this episode of TBBT.

  • 4.5 / 5.0
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"The Herb Garden Germination"

Sheldon and Amy spread gossip this week. Elsewhere, Howard takes a big step in his relationship with Bernadette.

  • 4.0 / 5.0
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"The Zarnecki Incursion"

Someone has the gall to hack into Sheldon's online game account this week. The guy go on a search to find out who would dare do such a thing.

  • 4.0 / 5.0
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"The Prestidigitation Approximation"

Wolowitz baffles Sheldon this week with a magic trick. Elsewhere, Leonard realizes that there's a problem with him dating Priya.

  • 3.5 / 5.0
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"The Toast Derivation"

Sheldon struggles with a realization on this episode: Leonard who is actually the center of the social group.

  • 3.5 / 5.0
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TBBT Quotes

Stephen Hawking: You made an arithmetic mistake on page two. It was quite a boner.
Sheldon: No, no ... that can't be right. I-I don't make arithmetic mistakes.
Stephen Hawking: Are you saying I do?
Sheldon: Oh, no, no, no, of course not. It's just, I was thinking.... Oh, gosh, golly, I made a boo-boo and I gave it to Stephen Hawking.
Stephen Hawking: Great, another fainter.

Sheldon: Why do you have the Chinese character for "soup" tattooed on your right buttock?
Penny: It's not "soup," it's "courage."
Sheldon: No it isn't. But I suppose it does take courage to demonstrate that kind of commitment to soup.
Penny: How'd you see it? You said you wouldn't look.
Sheldon: Sorry. As I told you, the hero always peeks.