Explain xkcd: It's 'cause you're dumb.
Nathan Fillion is famous for his role as Captain Mal in Firefly, playing Captain Hammer in Dr. Horrible's Sing-Along Blog, and his appearances in these xkcd comics. (Oh and he's Richard Castle)
Pages in category "Comics featuring Nathan Fillion"
The following 5 pages are in this category, out of 5 total.