The Secret Circle's Adam Harrington is set to guest star in the March 19th episode of Castle, "A Dance With Death". Harrington's character is Brad Melville, the host of a reality TV dance competition called 'A Night of Dance'. Lauralee Bell will also be guest starring as a Paula Abdul inspired character/judge with huge hair and a very fuchsia sequined dress. There's no news yet who the other judges will be, but Bell spoiled that one is as snarky as Simon Cowell and the other resembles a more French Piers Morgan.
In other casting news, Firefly fans can rejoice. ABC's Castle is reuniting Nathan Fillion with one of his former Firefly and Serenity co-stars, Adam Baldwin. Baldwin is set to guest star as a detective named Ethan Slaughter. Slaughter is described as a rough and tumble cop from the cities gang unit. Slaughter will land a case that Rick is desperate to follow and along the way Bladwin's character shows Castle the darker side of police work. Baldwin's episode is not slated to air until the Spring, when the cliffhanger season 4 finale will be on the horizon. Rick's new alliance with Ethan brings him to rethink what he's willing to do to close a case, placing Rick directly in the line of fire.
Source: Give Me My Remote, TV Guide