Sheldon beta tests an MIT invention after hearing it can help him read people's emotions. Also, Leonard can't hide his feelings when Penny announces her brother is coming to town and Raj invites his ex-girlfriends over to give him dating advice.
Trailer
Guest Cast
Kate Micucci
as Lucy
Cast Appearances
Kaley Cuoco
as Penny
Episode Discussion
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I wonder who'll play Penny's brother.
I'm hoping for Aaron Paul