ABC

Nathan Fillion, back in his Joey days on
"One Life to Live."

ABC's new cops-and-romance series "Castle" premieres Monday, March 9th (at 10pm/9c), and we can think of no better reason to check it out than the insane appeal of its lead actor, Nathan Fillion. The man's got it all: handsome, charming, funny, in possession of a geek-bestowed nickname that is almost unrivaled in pop culture ("Firefly" fans still fondly refer to him "Captain Tightpants"). He also has his roots firmly in daytime television, having spent three years on "One Life to Live" as Joey Buchanan.

So take a tour through our slideshow and let us count the ways we continue to fall for Nathan.