'Castle' star Nathan Fillion to do cameo appearance as himself in 'Big Bang Theory'

Actor Nathan Fillion will make a cameo as himself in the upcoming episode of “The Big Bang Theory”.

The 43-year-old will be seen on the popular sitcom's Feb 19 episode.

Fillion would be set sitting at a restaurant and being spotted by Raj (played by Kunal Nayyar) and Leonard (played by Johnny Galecki). The two then debate if it's really Fillion or not, and whether or not they should ask him for a photograph.

Fillion is well known for his role in the television series "Firefly" and "Castle".