Castle Season 4 Spoiler: Lost Actor Cast in Upcoming Film-Noir Episode

Castle’s 1940s film-noir episode won’t just give us a glimpse of the Castle gang in their finest Golden Age garb, we’ll also be meeting some fresh new faces.

According to TV Line, Supernatural and Lost star Mark Pellegrino will crop up as Tom Dempsey, a “ruthless club owner from 1947 who has it out for a private eye and his best girl … and whose shadowy dealings may be tied to a murder Castle and Beckett are investigating in the present day.” Intense!

Another fun tidbit as to how exactly we’ll see Castle all Sam Spade-d out: TV Line reports our crime novelist (you know, the one with an overactive imagination) will spend the “trippy” episode daydreaming he and Beckett are the aforementioned private eye and lady friend. Fun!

The ep should air during February sweeps week, which means it’ll probably be pretty epic. Can’t wait!

Source: TV Line