Leonard, Sheldon, Wolowitz and Koothrappali undertake a challenging and risky experiment-attending the Halloween party being thrown by their hot neighbor, Penny.
Leonard, Sheldon, Wolowitz and Koothrappali undertake a challenging and risky experiment-attending the Halloween party being thrown by their hot neighbor, Penny.
Guest Cast
Cast Appearances

Kaley Cuoco
as PennyEpisode Discussion
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