Sheldon has a revelation when he realizes why a song was stuck in his head. Also, Amy invites Dave over for dinner despite their previously awkward date, and Wolowitz and Koothrappali become obsessed with a fan of their band, "Footprints on the Moon".
Guest Cast
Cast Appearances
Kaley Cuoco
as Penny
Episode Discussion
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Ther is a full detailed account of this episode and the Dec 17th episode at bigbangtheory.wikia.com.