Castle

CASTLE - "That '70s Show" - When construction workers find the body of an infamous New York mobster who disappeared in the seventies, Beckett and Castle try to solve this three decade-old Mafia hit. Unfortunately, their only witness is a man who thinks it's still the 1970's, so to uncover what he knows, they must play into his delusion, and party like it's the last days of disco, on "Castle," MONDAY, APRIL 21 (10:01-11:00 p.m., ET) on the ABC Television Network. (ABC/Danny Feld) STANA KATIC, JOE POLITO, NATHAN FILLION, JON HUERTAS, SEAMUS DEVER

CASTLE - "Veritas" - A secret investigation conducted by Beckett related to her mother's murder goes awry when a man she has been surveilling is killed. When evidence links Beckett to the victim, she and Castle become the target of a manhunt that puts both of them in grave danger. MONDAY, MAY 5 (10:01-11:00 p.m., ET) on the ABC Television Network. (ABC/Ron Tom) PENNY JOHNSON JERALD, STANA KATIC, NATHAN FILLION