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Leonard, Sheldon, Wolowitz and Koothrappali undertake a challenging and risky experiment-attending the Halloween party being thrown by their hot neighbor, Penny.
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US Ratings:
8.40 million viewers; Nielsen Rating: 5.3/8. Nielsen 18-49 Rating: 3.4/9.
Guest Stars
Erin Allin O'Reilly as Cheryl, Brian Patrick Wade as Kurt, Rachel Cannon as Patty, Kimberly Kevon Williams as Vicki, Cynthia Holloway as Roberta
Writers
Dave Goetsch (Story), David Litt (Teleplay), Robert Cohen (Teleplay)
Director
Mark Cendrowski