Gang (1957) – Nick Rogers Zero Hour! (1957) – TV singer Suicide Battalion (1958) – Pvt. Tommy Novello How to Make a Monster (1958) – John Ashley Hot Rod Gang (1958) – John Abernathy III Frankenstein's Daughter (1958) – Johnny Bruder High School Caesar (1960) – Matt Stevens Hud (1963) – Hermy Beach Party (1963) – Ken Muscle Beach Party (1964) – Johnny Bikini Beach (1964) – Johnny Beach Blanket Bingo (1965) – Steve Gordon Young Dillinger (1965) – "Baby Face" Nelson How to Stuff a Wild Bikini (1965) – Johnny Sergeant Deadhead (1965) – Airman Filroy The Eye Creatures (1965, TV movie) – Stan Kenyon Hell on Wheels (1967) – Del Robbins Brides of Blood (1968) – Jim Farrell Manila, Open City (1968) – Morgan, a Medic The Mad Doctor of Blood Island (1968) – Dr. Bill Foster Beast of Blood (1970, also producer) – Dr. Bill Foster Beast of the Yellow Night (1971, also producer) – Joseph Langdon/Philip Rogers The Big Doll House (1971, associate producer only) The Twilight People (1972, also producer) – Matt Farrell The Woman Hunt (1972, also producer) – Tony Black Mama, White Mama (1972, producer only) Beyond Atlantis (1973, also producer) – Logan Savage Sisters (1974, also producer) – W. P. Billingsley Black Mamba (1974, also producer) – Dr. Paul Morgan Smoke in the Wind (1975) – Whipple Mondier Sudden Death (1977) – John Shaw Apocalypse Now (1979, associate producer only) Invisible Mom (1997) – Herbert Pringle (voice) (final film role) Scar City (1998, producer only) Television Men of Annapolis (1957) – Joe/Tony Bellor Jefferson Drum (1958) – Tim Keough The Deputy (1959) – Trooper Nelson The Millionaire (1960) – Ken Clarkson Death Valley Days (1961) – Sandy Straightaway (1961–1962) – Clipper Hamilton Wagon Train (1960–1963) – Michelangelo Fratelli/Bill Collier Petticoat Junction (1963) – Fred The Beverly Hillbillies (1963–1967) – Troy Apollo/Mike Wilcox/Bob Billington Dr Kildare (1964) – Mitch The Wild Wild West (1966) – Lt. Keighley Coach of the Year (1980, producer only) Will: G. Gordon Liddy (1982, producer only) The A-Team (1983–1986, executive producer) – narrator/radio newscaster/announcer (voice, uncredited) The Quest (1982, producer) Werewolf (1987, executive producer only) Something Is Out There (1988, producer only) Hardball (1989, producer only) Raven (1992, executive producer only) Journey to the Centre of the Earth (1993, producer only) Walker, Texas Ranger (1993–1994, executive producer only) Marker (1995, producer only) Lawless (1997, producer only) Unmade projects