Spoiler: info about 4/15/13 episode! CASTLE AND BECKETT ARE ON THE HUNT FOR BIGFOOT, ON ABC'S "CASTLE" "The Fast and the Furriest" - When Castle and Beckett find giant footprints at the site of a vicious murder, the team is forced to confront the unlikely theory that Bigfoot is the killer. But as they trek into the world of primate research, big game hunting and mythological creatures, they realize that finding the man (or beast) responsible may put them on the endangered species list, on "Castle," MONDAY, APRIL 15 (10:01-11:00 p.m., ET), on the ABC Television Network. "Castle" stars Nathan Fillion as Richard Castle, Stana Katic as NYPD Detective Kate Beckett, Susan Sullivan as Martha Rodgers, Molly Quinn as Alexis Castle, Penny Johnson Jerald as NYPD Captain Victoria Gates, Tamala Jones as Medical Examiner Lanie Parish, Jon Huertas as NYPD Detective Javier Esposito, and Seamus Dever as NYPD Detective Kevin Ryan. Guest cast: Arye Gross as M.E. Perlmutter, Aaron Hill as Kurt Wilson, Raphael Sbarge as Dr. Darrell Meeks, Palmer Davis as Garland Meeks, Albie Selznick as Dr. Paul Devlin. "The Fast and the Furriest" was written by Christine Roum and directed by Jonathan Frakes.