The Big Bang Theory

Season 4 Episode 16

The Cohabitation Formulation

20
Aired Monday 8:00 PM Feb 17, 2011 on CBS
AIRED:
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Episode Summary

Bernadette tells Howard that it's time to choose between moving in with her or staying with his mother. Leonard discovers Raj's sister Priya is back in town and reconnects with her, and Amy tries to comfort Penny when she finds out.

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Johnny Galecki

Johnny Galecki

Leonard Hofstadter

Jim Parsons

Jim Parsons

Sheldon Cooper

Kaley Cuoco

Kaley Cuoco

Penny

Simon Helberg

Simon Helberg

Howard Wolowitz

Kunal Nayyar

Kunal Nayyar

Rajesh Koothrappali

Melissa Rauch

Melissa Rauch

Bernadette Rostenkowski

Carol Ann Susi

Carol Ann Susi

Mrs. Wolowitz

Recurring Role

Aarti Mann

Aarti Mann

Priya Koothrappali

Recurring Role

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Trivia, Notes, Quotes and Allusions

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