•
The Ghost Ship (1943) as Sailor (uncredited) •
Sealed Cargo (1951) as Holtz (uncredited) (this film starred his brother
Dana Andrews) •
Geisha Girl (1952) as Rocky Wilson •
The Bad and the Beautiful (1952) as Actor in Georgia's Screen Test (uncredited) •
The Clown (1953) as Young Man •
Last of the Comanches (1953) as Lieutenant Floyd (uncredited) •
Battle Circus (1953) as Sergeant •
I Love Melvin (1953) as Photographer on Crane (uncredited) •
Dream Wife (1953) as Louis •
The Band Wagon (1953) as Passenger on Train (uncredited) •
So Big (1953) as Dirk DeJong •
Take the High Ground! (1953) as Lobo Naglaski •
Phantom of the Rue Morgue (1954) as Professor Paul Dupin •
Prisoner of War (1954) as Corporal Joseph Robert Stanton •
Rogue Cop (1954) as Eddie Kelvaney •
The Long Gray Line (1955) as Sergeant (uncredited) •
Bedevilled (1955) as Gregory Fitzgerald •
Meet Me in Las Vegas (1956) as Steve Forrest (uncredited) •
The Living Idol (1957) as Terry Matthews •
Alfred Hitchcock Presents (TV series) (1957) (Season 2 Episode 22: "The End of Indian Summer") as Joe Rogers •
Alfred Hitchcock Presents (TV series) (1958) (Season 3 Episode 33: "Post Mortem") as Steve Archer •
It Happened to Jane (1959) as Lawrence Clay "Larry" Hall •
Heller in Pink Tights (1960) as Clint Mabry • ''
Dick Powell's Zane Grey Theatre'' (1960, TV series) as Mike Bagley •
Five Branded Women (1960) as Sergeant Paul Keller •
Flaming Star (1960) as Clint Burton •
The Second Time Around (1961) as Dan Jones •
The Longest Day (1962) as Captain Harding •
The Twilight Zone (1963, TV series) as Major Robert Gaines •
The Yellow Canary (1963) as Hub Wiley •
The Virginian (1963–1964, TV series) as James Templeton / Roger Layton • ''
12 O'Clock High'' (1965, TV series) as Major Peter Gray •
Rawhide (1965, TV series) as Cable •
The Fugitive (1965, TV series) as Barry Craft • ''
Burke's Law'' (1965, TV series) as Jocko Creighton •
The Baron (1966–1967, TV series) as John Mannering 'The Baron' •
Cimarron Strip (1967–1968, TV series) as Clayton Tyce / Wiley Harpe •
Bonanza (1967-1969, TV series) as Dan Logan / Josh Tanner •
Rascal (1969) as Willard North •
Gunsmoke (1970–1973, TV series) as Scott Coltrane / Cord Wrecken / Cole Morgan / Will Mannon •
The High Chaparral (1970, TV series) as Johnny Rondo •
The F.B.I. (1970) as Lee Barrington •
The Wild Country (1970) as Jim Tanner •
The Late Liz (1971) as Jim Hatch •
Mission: Impossible (1971, TV series) as Edward Granger •
Nichols (1971, TV series) as Sam Yeager •
Alias Smith and Jones (1972, TV series) as Jake Halloran •
Night Gallery (1972, TV series) as Grant Wilson (segment "Hatred Unto Death") / Sam Dichter (segment "The Waiting Room") •
The Sixth Sense (1972, TV series) as Glenn Tuttle •
Ghost Story (1972, TV series) as Andrew Alcott •
Hec Ramsey (1972, TV series) as Wes Durham •
The Streets of San Francisco (1973, TV series) as Art Styles •
The Hanged Man (1974) (TV pilot) as James Devlin •
The Six Million Dollar Man (1974, TV series) as Quail •
Cannon (1974, TV series) as Arthur Rogers •
S.W.A.T. (1975–1976, TV series) as Lieutenant Dan "Hondo" Harrelson •
Testimony of Two Men (1977, TV series) as Martin Eaton •
Last of the Mohicans (1977, TV movie) as Hawkeye •
Maneaters Are Loose! (1978) as David Birk •
The Deerslayer (1978) as Hawkeye •
Captain America (1979, TV movie) as Lou Brackett •
North Dallas Forty (1979) as Conrad Hunter •
Condominium (1980, TV movie) as Gus Garver •
Mommie Dearest (1981) as Greg Savitt •
Hotline (1982, TV movie) as Tom Hunter •
Malibu (1983, TV movie) as Rich Bradley •
Sahara (1983) as Gordon •
Hollywood Wives (1985, TV series) as Ross Conti •
Spies Like Us (1985) as General Sline •
Dallas (1985 & 1986, TV series) as Ben Stivers (1985, The Dream Season) & Wes Parmalee (1986) •
Amazon Women on the Moon (1987) as Captain Steve Nelson (segment "Amazon Women on the Moon") •
Gunsmoke: Return to Dodge (1987, TV movie) as Will Mannon •
Dream On (1990, TV series) as Eden Pilott •
Murder, She Wrote — Night of the Coyote (1992, TV series) •
Storyville (1992) as Judge Quentin Murdoch •
Columbo: A Bird in the Hand (1992) as Big Fred •
Killer: A Journal of Murder (1995) as Warden Charles Casey •
S.W.A.T. (2003) as SWAT Truck Driver (cameo) (final film role) ==Radio appearances==