CASTLE AND BECKETT FIND THEMSELVES IN FLASHBACK MODE TO THE 1940s, ON ABC'S "CASTLE"

Mark Pellegrino Guest Stars

"The Blue Butterfly" - When Castle and Beckett investigate the killing of a treasure hunter, they discover the case is linked to a mysterious homicide from 1947 involving a hard-boiled private detective. Castle realizes the only way to solve the present-day murder is to solve the murder from the past. The 1947 case comes to life through stylized flashbacks, featuring Castle as the private eye and Beckett as a femme fatale, on "Castle," MONDAY, FEBRUARY 6 (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: Mark Pellegrino as Tom Dempsey, Patrick Cassidy as Clyde Belasco, Chad Everett as Jerry Maddox, Ellen Geer as Viola Maddox, Darin Toonder as Frankie.

"The Blue Butterfly" was written by Terrence Paul Winter and directed by Chuck Bowman (executive producer Rob Bowman's father).

"Castle" is broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1 channel surround sound. A TV parental guideline will be assigned closer to airdate.

For more information on "Castle," visit ABC.com/Castle