Nathan Fillion to Portray Himself on The Big Bang Theory

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Nathan Fillion may play the hot detective on Castle, but to geeks everywhere, he's a hot commodity, as well.

Thanks to roles in series such as Firefly, Dr. Horrible's Sing-Along Blog and Buffy the Vampire Slayer, he's got wicked geek cred. So much so that he's about to drive them wild on The Big Bang Theory – as himself!

Nathan Fillion TBBT

That's right, EW first reported Fillion will make a cameo appearance on The Big Bang Theory on the Feb. 19th episode when Raj and Leonard spot the mega star sitting in a restaurant. The two will ponder the viability of the discovery – can it really be Nathan Fillion and should they ask for a photo?

If you're a TBBT fan, you know Sheldon is a big Firefly fan who likes to lament its cancelation. This is sure to put a bug in his bonnet. Will he believe the duo actually met Fillion or would even a photo not prove to be worth a thousand words in this case?

We'll have to wait and watch, but it's sure to be plenty of fun. 

If you're in need of a fix, you can watch The Big Bang Theory online via TV Fanatic.

Carissa Pavlica is the managing editor and a staff writer for TV Fanatic. She's a member of the Broadcast Television Journalists Association (BTJA), enjoys mentoring writers, wine, and passionately discussing the nuances of television. Follow her on Twitter and email her here at TV Fanatic.

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TBBT Quotes

Penny: What actor holds the record for being named People magazine's Sexiest Man Alive?
Sheldon: William Shatner!
Leonard: I don't think it's Shatner.
Sheldon: Then it's got to be Patrick Stewart

Penny: Here's a question-- as an alien pretending to be human, are you planning to engage in any post-prom mating rituals with Amy?
Sheldon: There are post-prom mating rituals?
Penny: Not always. Unless your date drives a van with an air mattress, then always.
Sheldon: Well, if it's part of the prom experience, then I'm open to it.
Penny: You're kidding.
Sheldon: I may be an alien, but I have urges.If Amy wants to copulate by firing her eggs into space, well, then, I will happily catch them with the reproductive sac on my upper flermin. I'm not the best at reading facial cues, but I can see that you're a little turned on.