CASTLE AND BECKETT RACE AGAINST TIME TO STOP A SERIAL KILLER, ON ABC'S "CASTLE"

Lee Tergesen and Michael Mosley Guest Star

"3XK" - When a beautiful woman is found dead in an alley, all clues point to her being a victim of the notorious Triple Killer. The Triple Killer, or 3XK, terrorized New York City four years ago, then mysteriously disappeared. Now he's back. In a deadly battle of wits, Castle and Beckett race against time to stop 3XK before he claims his next victims. Lee Tergesen of "Oz" (as Marcus Gates, a violent felon and prime suspect in the serial killer investigation) and Michael Mosley of "Scrubs" (Gates' former cellmate) guest star in "3XK," one of the most thrilling episodes of the series to date, on "Castle," MONDAY, JANUARY 17 (10:01-11:00 p.m., ET), on the ABC Television Network. (Rebroadcast. OAD 10/25/10)

"Castle" stars Nathan Fillion as Richard Castle, Stana Katic as NYPD Detective Kate Beckett, Susan Sullivan as Martha Rodgers, Molly Quinn as Alexis Castle, Ruben Santiago-Hudson as NYPD Captain Roy Montgomery, Tamala Jones as Medical Examiner Lanie Parish, Jon Huertas as NYPD Detective Javier Esposito and Seamus Dever as NYPD Detective Kevin Ryan.

Guest Cast: Lee Tergesen as Marcus Gates, Michael Mosley as Jerry Tyson, Brian Klugman as Paul McCardle, Joe O'Connor as Cal Townsend, Anne Marie Howard as Angela Russo.

"3XK" was written by David Amann and directed by Bill Roe.

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

For more information on "Castle," visit ABC.com. Viewers can also follow the show via http://facebook.com/Castle and Twitter: Castle_ABC