Sheldon faces a personal crisis after deciding he's wasting his time with string theory. Meanwhile, a double date between Raj, Emily and the Wolowitzes ends in embarrassment for Howard.
Sheldon faces a personal crisis after deciding he's wasting his time with string theory. Meanwhile, a double date between Raj, Emily and the Wolowitzes ends in embarrassment for Howard.
Guest Cast

Stephen Hawking
voices Himself
Phyllis Timbes
voices VoicemailCast Appearances

Kaley Cuoco
as PennyEpisode Discussion
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