Watch The Big Bang Theory Season 5 Episode 1 online via TV Fanatic with over 2 options to watch the The Big Bang Theory S5E1 full episode. Affiliates with free and paid streaming include Amazon and iTunes.

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Episode Details

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

Rating: 4.2 / 5.0 (89 Votes)
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The Big Bang Theory Season 5 Episode 1 Quotes

You can't blame yourself. When your prefrontal cortex fails to make you happy promiscuity rewards you with the needed flood of dopamine. We, neurobiologists, refer to this as the skank reflex.


I feel like two totally different people. Dr. Jekyyl and Mrs. Whore.