The Prodigal Katherine need help from J.R. after Cliff is given power at Wentworth Tool and Die. Donna discovers a dreadful secret from the Ewing and Culver family pasts. J.R. manages to get his hands on Christopher's birth records. Details Casts Title The Prodigal Genres Soap Drama Family Release Date 1982-03-05 Episode Runtime 00 Hours 45 Minutes Season Number 5 Episode Number 21 Production Companies Patrick Duffy Bobby Ewing Barbara Bel Geddes Miss Ellie Linda Gray Sue Ellen Shepard Ewing Larry Hagman J.R. Ewing Ken Kercheval Cliff Barnes Susan Howard Donna Culver Krebbs Victoria Principal Pamela Barnes Ewing Charlene Tilton Lucy Ewing Steve Kanaly Ray Krebbs