Kevin Ryan Character Gallery

CASTLE - "Tick, Tick, Tick..." -- Actress Dana Delany ("Desperate Housewives") will guest star in two episodes of "Castle," beginning MONDAY, MARCH 22 (10:02-11:00 p.m., ET), with Part 2 (entitled "Boom!," airing 10:02-11:00 p.m., ET) on Monday, March 29 on ABC. (ABC/KAREN NEAL) DANA DELANY, NATHAN FILLION, STANA KATIC, RUBEN SANTIAGO-HUDSON, JON HUERTAS, SEAMUS DEVER