Casting for Fox 2000′s sequel Percy Jackson & The Olympians: The Sea of Monsters is continuing as THR reports that Castle star Nathan Fillion has joined the ranks. He has been cast as Greek deity Hermes for the adaptation, which also stars Logan Lerman, Alexandra Daddario, Brandon T. Jackson and Jake Abel.

We got word that a sequel was coming almost a year ago, with hopes of hitting theaters sometime in 2013, despite preforming rather poorly at the box office. Chris Columbus directed the first film, but has since been replaced by Thor Freudenthal, who is known for his work on Diary of a Wimpy Kid and Hotel for Dogs. Based on the best selling series by Rick Riordan, The Sea of Monsters follows the son of Poseidon and his friends as they head into the Sea of Monsters to find the mythical Golden Fleece.

Hermes was originally played by Dylan Neal, and is the father of the antagonist Luke, who is played by Abel. Fillion has gathered a pretty big following after he starred in the sci-fi TV show Firefly and the indie dramedy Waitress. He will be seen next in the screen adaptation of Shakespeare’s Much Ado About Nothing, out sometime this year.

What do you think of Fillion playing Hermes for the Percy Jackson sequel?