Before he was using fancy facial creams as mystery writer Rick Castle, actor Nathan Fillion sported a more rugged, manly look. In 2004, the now clean-shaven Mr. Fillion had a full-on mustache!

Say what?!

Yes, it's true, Castle fans. After Nathan's stint as Captain Mal Reynolds on Firefly came to an end in 2003, the hunky Canadian unplugged his electric razor and went au naturale.

Although we saw Nathan rock a mini 'stache in the pilot episode of Castle, it was nothing compared to this retro look.

What do you think of Nathan's facial hair? Is it a look you'd like to see in Season 5, or should it stay in 2004? 

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