'The Big Bang Theory' Season 8 Spoilers: Sheldon Becomes Ultimate Fanboy With 'Firefly' Star Nathan Fillion?

February 3, 2015 3:03 AM

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"Castle" star Nathan Fillion will make a cameo in an episode of "The Big Bang Theory" season 8, according to the spoilers from Entertainment Weekly.

The report said that Nathan Fillion will appear as himself as Sheldon and the rest of the gang will go all nerdy when they get the chance to meet the "Firefly" actor.

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