Nathan Fillion To Cameo On 'Big Bang Theory'

Nathan Fillion To Cameo On 'Big Bang Theory'
LOS ANGELES, CA - NOVEMBER 23: Actor Nathan Fillion attends the 2014 American Music Awards at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
LOS ANGELES, CA - NOVEMBER 23: Actor Nathan Fillion attends the 2014 American Music Awards at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Steve Granitz/WireImage)

Nathan Fillion is set to cameo as himself in an upcoming episode of "The Big Bang Theory," EW has learned exclusively.

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