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The Big Bang Theory S4E9 poster

Watch The Big Bang Theory – Season 4 Episode 9: The Boyfriend Complexity

The Big Bang Theory • Season 4, Episode 9 • 21 min • 2007 • ⭐ 7.9/10 • Comedy

Cast: Jim Parsons , Kaley Cuoco , Johnny Galecki , Simon Helberg , Kunal Nayyar , Melissa Rauch , Mayim Bialik

Directors: Chuck Lorre , Bill Prady

Watch The Big Bang Theory – S4E9

Episode Overview

Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.

Episode Navigation

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