CASTLE AND BECKETT DISCOVER CLUES ABOUT HIS TWO-MONTH DISAPPEARANCE, BUT HIS INVESTIGATION LEADS THEM INTO DANGER, ON ABC'S "CASTLE"

"Sleeper" - A mysterious recurring dream drives Castle and Beckett to seek answers about the two-month period when he went missing. But their search for the truth has deadly consequences, on "Castle," MONDAY, APRIL 20 (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: Mackenzie Astin as Phillip Bartlett, Michael Dorn as Dr. Carter Burke, Matt Letscher as Jenkins, Maya Stojan as Tory Ellis.

"Sleeper" was written by David Amann and directed by Paul Holahan.

"Castle" is produced by ABC Studios. The executive producers are Andrew Marlowe (creator), David Amann (showrunner), Rob Bowman, Armyan Bernstein, Rob Hanning and Terri Edda Miller.

"Castle" is broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1 channel surround sound. This program carries a TV-PG,V parental guideline.

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