Credits

• 2013 · Greenboy: Prescription for Death as Bill Gannon (archive footage)
• 2004 · Los Angeles Plays Itself as Officer Bill Gannon in Dragnet (archive footage)
• 2002 · M*A*S*H: 30th Anniversary Reunion as Himself
• 2001 · The Shootist: The Legend Lives On as Self (archive footage) (uncredited)
• 1999 · Love & Money as
• 1997 · Family Plan as Sol Rubins
• 1996 · 3rd Rock from the Sun as Professor Suter
• 1995 · The Jeff Foxworthy Show as
• 1994 · Incident in a Small Town as Judge Bell
• 1993 · Grace Under Fire as
• 1992 · Renegade as
• 1992 · Against Her Will: An Incident in Baltimore as Judge Stoddard Bell
• 1991 · Memories of M*A*S*H as Self / Sherman Potter
• 1990 · The Incident as Judge Bell
• 1989 · The Simpsons as Bill Gannon (voice)
• 1988 · 14 Going on 30 as Uncle Herb
• 1987 · Dragnet as Captain Gannon
• 1986 · Blacke's Magic as Leonard Blacke
• 1985 · The Twilight Zone as
• 1984 · Murder, She Wrote as Retired Lt. Richard Webb
• 1983 · Sparkling Cyanide as Captain Kemp
• 1983 · AfterMASH as Sherman T. Potter
• 1982 · Showbiz Goes to War as (archive footage)
• 1982 · The Flight of Dragons as Carolinus (voice)
• 1981 · Rivkin: Bounty Hunter as Father Everett Kolodny
• 1980 · More Wild Wild West as Robert T. 'Skinny' Malone
• 1980 · Scout's Honor as Mr. Briggs
• 1980 · Roughnecks as Plug Champion
• 1979 · Better Late Than Never as Mr. Scott
• 1979 · The Apple Dumpling Gang Rides Again as T.P. Gaskill
• 1979 · You Can't Take it With You as Mr. DePinna
• 1979 · The Wild Wild West Revisited as Robert T. Malone
• 1979 · Roots: The Next Generations as Bob Campbell
• 1979 · Backstairs at the White House as Pres. Harry S. Truman
• 1978 · The Cat from Outer Space as General Stilton
• 1978 · Kate Bliss and the Ticker Tape Kid as Hugo Peavey
• 1978 · The Bastard as Capt. Caleb
• 1978 · Murder at the Mardi Gras as Jim Bob Jackson
• 1978 · Maneaters Are Loose! as Toby Waites
• 1978 · Confessions of the D.A. Man as H.M. 'Staff' Stafford
• 1977 · The Love Boat as Wendell Snead
• 1977 · The Love Boat as Milo Endler
• 1977 · The Love Boat as Charly Fields
• 1977 · Exo-Man as Arthur Travis
• 1976 · The Shootist as Marshall Thibido
• 1975 · The Apple Dumpling Gang as Homer McCoy
• 1975 · Bronk as
• 1975 · The Last Day as Narrator
• 1974 · Dinah! as Self
• 1974 · Sidekicks as Sheriff Jenkins
• 1973 · Charley and the Angel as Angel
• 1972 · Snowball Express as Jesse McCord
• 1972 · The Century Turns as Doc Amos B. Coogan
• 1972 · M*A*S*H as Sherman Potter
• 1972 · M*A*S*H as General Steele
• 1972 · Hec Ramsey as Doc Amos Coogan
• 1971 · Ellery Queen: Don't Look Behind You as Insp. Richard Queen
• 1971 · The D.A. as H.M. 'Staff' Stafford
• 1971 · Cat Ballou as The Rancher
• 1971 · Scandalous John as Sheriff Pippin
• 1971 · Support Your Local Gunfighter as Taylor
• 1971 · The Barefoot Executive as E.J. Crampton
• 1971 · The Feminist and the Fuzz as Horace Bowers
• 1970 · Night Gallery as Thaddeus Conway
• 1970 · But I Don't Want to Get Married! as Mr. Good
• 1970 · The Partridge Family as Cal
• 1970 · The Partridge Family as Willie Larkin
• 1969 · Viva Max! as Chief of Police Sylvester
• 1969 · Love, American Style as Woody
• 1969 · Support Your Local Sheriff! as Olly Perkins
• 1969 · Dragnet as Bill Gannon
• 1968 · Star Spangled Salesman as TV Cop
• 1967 · The Flim-Flam Man as Sheriff Slade
• 1967 · Dragnet as Officer Bill Gannon
• 1966 · What Did You Do in the War, Daddy? as Major Pott
• 1966 · Frankie and Johnny as Cully
• 1965 · The Wackiest Ship in the Army as
• 1965 · John Goldfarb, Please Come Home! as Sarajevo
• 1964 · Kentucky Jones as Seldom Jackson
• 1963 · The Richard Boone Show as
• 1962 · How the West Was Won as Gen. Ulysses S. Grant
• 1962 · Going My Way as
• 1962 · Ensign O'Toole as Charlie
• 1962 · The Virginian as Kendall Jones
• 1961 · Dr. Kildare as Francis X. Healy
• 1960 · Cimarron as Jessie Rickey
• 1960 · Here's Hollywood as
• 1960 · Pete and Gladys as
• 1960 · Inherit the Wind as Judge Mel
• 1960 · The Mountain Road as Mike Michaelson
• 1959 · The Untouchables as George 'Bugs' Moran
• 1959 · It Started with a Kiss as Charles Meriden
• 1957 · Under Fire as Sgt. Joseph C. Dusak
• 1957 · Have Gun, Will Travel as Sheriff Ernie Backwater
• 1957 · Have Gun, Will Travel as Fred Braus
• 1957 · The Teahouse of the August Moon as Sergeant Gregovich
• 1956 · Star in the Dust as Lew Hogan
• 1956 · Backlash as Tony Welker
• 1955 · The 20th Century Fox Hour as Mike Feeney
• 1955 · Alfred Hitchcock Presents as Hermie Jenkins
• 1955 · Gunsmoke as Jed Hockett
• 1955 · Gunsmoke as Osgood Pickett
• 1955 · Gunsmoke as John Milligan
• 1955 · Strategic Air Command as Sergeant Bible
• 1955 · Not as a Stranger as Oley
• 1954 · December Bride as Pete Porter
• 1954 · About Mrs. Leslie as Fred Blue
• 1954 · The Forty-Niners as Alf Billings
• 1954 · Prisoner of War as Maj. O.D. Hale
• 1954 · The Lone Wolf as Jim Strait
• 1954 · The Far Country as Ketchum
• 1954 · The Glenn Miller Story as Chummy MacGregor
• 1953 · Torch Song as Joe Denner
• 1953 · Champ for a Day as Al Muntz
• 1953 · Arena as Lew Hutchins
• 1953 · Thunder Bay as Rawlings
• 1952 · Stop, You're Killing Me as Innocence
• 1952 · Toughest Man in Arizona as Verne Kimber
• 1952 · Cavalcade of America as Homer Byington
• 1952 · Apache War Smoke as Ed Cotten
• 1952 · What Price Glory as Sergeant Moran
• 1952 · High Noon as Sam Fuller
• 1952 · My Six Convicts as Dawson
• 1952 · The Devil and John Q as Abe Lincoln
• 1952 · Bend of the River as Shorty
• 1952 · Scandal Sheet as Biddle
• 1952 · Boots Malone as Quarter Horse Henry
• 1951 · The Blue Veil as Charles Hall
• 1951 · The Well as Claude Packard
• 1951 · When I Grow Up as Father Reed (Modern)
• 1951 · The Amazing Mr. Malone as
• 1951 · Belle Le Grand as Abel Stone
• 1950 · Dark City as Soldier
• 1950 · The Showdown as Rod Main
• 1950 · Appointment with Danger as George Soderquist
• 1950 · Outside the Wall as Garth
• 1949 · Holiday Affair as Police Lieutenant
• 1949 · Strange Bargain as Richard Webb
• 1949 · Red Light as Rocky
• 1949 · Madame Bovary as Hyppolite
• 1949 · Down to the Sea in Ships as Britton
• 1949 · Hello Out There as The Young Gambler
• 1948 · Yellow Sky as Half Pint
• 1948 · Moonrise as Billy Scripture
• 1948 · The Saxon Charm as Hermy
• 1948 · Race Street as Hal Towers
• 1948 · All My Sons as Frank Lubey
• 1948 · The Big Clock as Bill Womack
• 1947 · The Gangster as Shorty
• 1946 · It Shouldn't Happen to a Dog as Gus Rivers
• 1946 · Somewhere in the Night as Bath Attendant
• 1946 · Dragonwyck as Klaas Bleecker
• 1946 · Johnny Comes Flying Home as Joe Patillo
• 1946 · From This Day Forward as Hank Beesley
• 1945 · State Fair as Barker
• 1945 · A Bell for Adano as Capt. N. Purvis
• 1944 · Gentle Annie as Cottonwood Goss (as Henry Morgan)
• 1944 · Take It or Leave It as (archive footage) (uncredited)
• 1944 · Roger Touhy, Gangster as Thomas "Smoke" Reardon
• 1944 · The Eve of St. Mark as Private Shevlin
• 1944 · Wing and a Prayer as Malcolm Brainard
• 1943 · Happy Land as Tony Cavrek (as Henry Morgan)
• 1943 · Crash Dive as Brownie
• 1943 · The Ox-Bow Incident as Art Croft
• 1942 · To the Shores of Tripoli as Mouthy
• 1942 · Orchestra Wives as Cully Anderson
• 1942 · The Omaha Trail as Henchman Nat
• 1942 · The Loves of Edgar Allan Poe as Ebenezer Burling
• 1933 · The Kennel Murder Case as Gamble (uncredited)