Browncoats have a new reason to rejoice. No, Firefly is not coming back to the air with all-new episodes. But, Nathan Fillion and Adam Baldwin are set to stage a little reunion on ABC's hit mystery series Castle.

Adam Baldwin, who played Jayne Cobb opposite Nathan Fillion's Capt. Mal Reynolds on the cult favorite series Firefly, is joining his former co-star's show as a rough and tumble cop named Ethan Slaughter, whom Castle decides to shadow for a few days. Slaughter shows Castle the dirtier side of police work, and before he knows it, Castle is caught in the line of fire like never before.

This will be the first time that Nathan Fillion has reteamed with one of his Firefly co-stars on Castle.

This awaited Reunion is scheduled to air sometime in the spring.