The Cohabitation Formulation

Feb 17, 2011 on CBS at 8:00 PM
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Summary

As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.

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The Benefactor Factor
Season 4 Episode 15

Feb 10, 2011

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The Toast Derivation
Season 4 Episode 17

Feb 24, 2011

Guest stars

Aarti Mann, Carol Ann Susi