Although he never fully achieved star status in features, Mitchell remained prolific until the early 1990s, with nearly 100 feature credits to his name. As with many other aging leading man, he began to make films in Europe during the 1960s, and played more character roles as the years passed. Some of Mitchell's more notable films during the latter part of his career include Monte Hellman's unusual Western, "Ride in the Whirlwind" (1966) and other features including "Buck and the Preacher" (1972), "The Swarm" (1978), "My Favorite Year" (1982) and "Code Name Vengeance" (1989). Though many of his credits are decidedly minor fare--29 of them during his last decade of work alone--Mitchell brought intelligence, grit and commitment to his roles, appearing in action films, horror thrillers and other similar items until shortly before his death.