In 1962, Stockwell divorced Perkins, and subsequently appeared in an adaptation of Eugene O'Neill's play "Long Day's Journey Into Night" along with Katharine Hepburn, Ralph Richardson and Jason Robards, under the direction of Sidney Lumet. Stockwell later called it "as intense and rewarding an experience as I've had." He subsequently guest starred on "Combat!", "The Greatest Show on Earth", "The Defenders", "The Eleventh Hour", "Kraft Suspense Theatre", "Burke's Law", and had a six-episode arc on "Dr. Kildare". Stockwell had a supporting part in the feature "Rapture" (1965).