Credit: Ron Tom/ABC Television Group © 2011 Disney Photo: Secret Circle's Adam Harrington Plays Brad Melville in Castle Season 4, Episode 18: "A Dance With Death"

If you’ve been missing the hot dads whose children make up Chance Harbor’s witchy Secret Circle, we have good news. Adam Harrington (Ethan) is set to guest star on Castle Season 4, Episode 18, "A Dance With Death," which will air Monday, March 19 at 10 p.m. ET.

While we’re used to seeing Ethan throwing ‘em back at the Boathouse Grill, it looks like his Castle character doesn’t hit the bottle nearly as hard. Instead, he’s playing Brad Mellville, who seems to be taking a cue from Dancing With the Stars host Tom Bergeron. As per usual with the ABC show, Detective Beckett and writer Castle show up at a dance competition show, A Night of Dance, when one of the contestants is found dead in her dressing room. If Brad ends up as the murderer, maybe we’ll get a peek at the Evil Ethan we’ve been hoping to see on TSC! Plus, he’s scrapped his usual flannel for a blindingly bright suit and a shave, so... bonus?

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