Jason Thompson (Patrick) took a break from his GH hospital duties to for a guest gig on CASTLE, where he was reunited with former co-star Seamus Dever (ex-Ian). In the episode, entitled "Once Upon A Crime", Thompson plays Noah Curtis, the husband of a woman who was found murdered — and was dressed as Snow White at the time of her death."With everything going on at GH [with Robin's impending exit], it was great to mix things up and spend the day over there," remarks the actor. "It was fun to put on someone else's shoes for a day." Look for Thompson's episode to air on February 27.