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Firefly references on Castle. Click through for gif. This was posted with the line "i may not be over it but i will never be as not over it as nathan fillion is."

Happy birthday, Nathan Fillion: His best GIFs, from 'Castle' to 'Firefly'

Happy birthday, Nathan Fillion: His best GIFs, from 'Castle' to 'Firefly'

my gifs castle nathan fillion Firefly 1k notes caskett ppl: nathan fillion i can't with you mine: nathan gif

Happy birthday, Nathan Fillion: His best GIFs, from 'Castle' to 'Firefly'

Happy birthday, Nathan Fillion: His best GIFs, from 'Castle' to 'Firefly'

It's Nathan Fillion's birthday, and there's no better way to celebrate than with GIFs from "Castle," "Firefly" and "Dr. Horrible's Sing-Along Blog."

TV GIFs of the Week (and the Best of Malcolm Reynolds)

Happy birthday, Nathan Fillion: His best GIFs, from 'Castle' to 'Firefly'