DANA DELANY TO GUEST STAR IN TWO EPISODES OF "CASTLE," BEGINNING SUNDAY, MARCH 21 ON ABC

Reunites With Nathan Fillion from Time on "Desperate Housewives"

"Tick, Tick, Tick..." -- Actress Dana Delany ("Desperate Housewives") will guest star in two episodes of "Castle," beginning SUNDAY, MARCH 21 (10:01-11:00 p.m., ET), with the second episode (entitled "Boom!," airing 10:00-11:00 p.m., ET) on Monday, March 22 on ABC.

In the special two-part storyline, Delany plays Federal Agent Jordan Shaw, an insightful and accomplished Federal investigator who teams up with Castle & Beckett to hunt down a cunning and elusive serial killer. This will reunite her and Nathan Fillion, who played Dr. Adam Mayfair, the younger husband of Katherine Mayfair (Delany) on "Desperate Housewives."

"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: Dana Delany as Federal Agent Jordan Shaw, Leonard Roberts as Jason Avery, Andrew Rothenberg as Donald Salt, Dameon Clarke as the killer, Jim Hoffmaster as Clerk.

"Tick, Tick, Tick..." was written by Moira Kirland and directed by Bryan Spicer.

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

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