Firefly hero Nathan Fillion has signed on to join The Three Musketeers hero Logan Lerman for Percy Jackson: Sea of Monsters the sequal to 2010's Percy Jackson and the Lightning Thief.
The Castle star will play Greek god Hermes, taking over the role from Dylan Neal who played him in the original film according to The Hollywood Reporter.
Fillion joins new recruits Mary Birdsong, Yvette Nicole Brown and Missi Pyle who will play The Fates in the sequel that will see Logan Lerman reprise his role as the titular Percy Jackson, while Alexandra Daddario, Brandon T Jackson and Jake Abel are expected to return as well.
As well as Castle, Fillion can be heard as Green Lantern in the direct to DVD film
Justice League: Doom and has Joss Whedon's Much Ado About Nothing in post production.
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