Nathan Fillion to Appear on Big Bang Theory

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Nathan Fillion is set to cameo as himself in an upcoming episode of The Big Bang Theory.

The Castle star will appear in the Feb. 19 episode, in which Raj and Leonard see him sitting at a restaurant and debate whether or not it’s really him and whether or not they should ask him for a picture. 

The Big Bang Theory airs Thursdays at 8 p.m. ET on CBS.