(1968) Planet of the Apes

as Cornelius

(1972) The Poseidon Adventure

as Acres

(1980) The Return of the King

as Samwise Gamgee (voice)

(1943) Lassie Come Home

as Joe Carraclough

(1971) Escape from the Planet of the Apes

as Cornelius

(1972) Conquest of the Planet of the Apes

as Caesar

(1973) Battle for the Planet of the Apes

as Caesar

(1965) The Greatest Story Ever Told

as Matthew

(1982) Evil Under the Sun

as Rex Brewster

(1966) The Defector

as Agent Adams

(1987) Overboard

as Andrew

(1967) The Adventures of Bullwhip Griffin

as Bullwhip Griffin

(1968) 5 Card Stud

as Nick Evers

(1989) Cutting Class

as Mr. Dante

(1965) That Darn Cat!

as Gregory Benson

(1982) Class of 1984

as Terry Corrigan

(1979) Scavenger Hunt

as Jenkins

(1982) The Making of Agatha Christie's 'Evil Under the Sun'

as Self / Rex Brewster

(1941) Man Hunt

as Vaner

(1985) Fright Night

as Peter Vincent

(1967) It!

as Arthur Pimm

(1963) Cleopatra

as Octavian - Caesar Augustus

(1978) Circle of Iron

as White Robe

(1971) Bedknobs and Broomsticks

as Mr. Jelk

(1996) It's My Party

as Damian Knowles

(1962) The Longest Day

as Pvt. Morris

(1960) Midnight Lace

as Malcolm

(1972) The Life and Times of Judge Roy Bean

as Frank Gass

(1938) Murder in the Family

as Peter Osborne

(1969) Hello Down There

as Nate Ashbury

(1996) Star Hunter

as Riecher

(1999) Linda Darnell: Hollywood's Fallen Angel

as ---

(1990) Shakma

as Sorenson

(1941) How Green Was My Valley

as Huw Morgan

(1973) The Legend of Hell House

as Benjamin Franklin Fischer

(1965) The Loved One

as D.J. Jr.

(1991) Deadly Game

as Dr. Aaron

(1995) The Grass Harp

as Amos Legrand

(1975) Funny Lady

as Bobby Moore

(1978) Laserblast

as Doctor Mellon

(1975) The White Seal

as Narrator/ White Seal

(1998) Behind the Planet of the Apes

as Self - Host

(1944) The Keys of the Kingdom

as Francis Chisholm, as a boy

(1981) Charlie Chan and the Curse of the Dragon Queen

as Gillespie

(1988) Fright Night Part 2

as Peter Vincent

(1965) Inside Daisy Clover

as Walter Baines

(1967) Cricket on the Hearth

as Cricket Crocket (voice)

(1974) Dirty Mary Crazy Larry

as George Stanton (uncredited)

(1938) Convict 99

as Jimmy

(1978) The Cat from Outer Space

as Mr. Stallwood

(1943) My Friend Flicka

as Ken McLaughlin

(1997) The Second Jungle Book: Mowgli & Baloo

as King Murphy

(1944) The White Cliffs of Dover

as John Ashwood II as a Boy

(1971) Pretty Maids All in a Row

as Mr. Proffer

(1987) Dead of Winter

as Mr. Murray

(1945) Thunderhead: Son of Flicka

as Ken McLaughlin

(1966) Lord Love a Duck

as Alan Musgrave

(1976) Mowgli's Brothers

as Mowgli (voice)

(1980) The Forgotten City of the Planet of the Apes

as Galen

(1975) Mean Johnny Barrows

as Tony Da Vince

(1942) The Pied Piper

as Ronnie Cavanaugh

(1994) Mirror Mirror 2: Raven Dance

as Dr. Lasky

(1972) Corky

as Harassed Salesman

(1941) Confirm or Deny

as Albert Perkins

(1989) Carmilla

as Inspector Amos

(1978) Rabbit Test

as Gypsy Grandmother / Dr. D & C Fishbine

(1964) Shock Treatment

as Martin Ashley

(1996) Unlikely Angel

as Saint Peter

(2000) Mary Pickford: A Life on Film

as Self

(1948) Kidnapped

as David Balfour

(1969) Angel, Angel, Down We Go

as Santoro

(1972) Hollywood: The Dream Factory

as Self (archive footage)

(1950) Killer Shark

as Ted White

(1995) Darryl F. Zanuck: 20th Century Filmmaker

as Self

(2001) Cleopatra: The Film That Changed Hollywood

as Self (archive footage)

(1960) The Tempest

as Ariel

(1965) The Third Day

as Oliver Parsons

(1963) The Power and the Glory

as Mestizo

(1976) Embryo

as Frank Riley

(1946) Holiday in Mexico

as Stanley Owen

(1994) The Story of Lassie

as Self

(1995) The Alien Within

as Dr. Henry Lazarus

(1978) The Thief of Baghdad

as Hasan

(1984) The Zany Adventures of Robin Hood

as Prince John

(1973) Arnold

as Robert

(1977) Flood!

as Mr. Franklin

(1982) Twilight Theatre

as Self - Host

(1994) Angel 4: Undercover

as Geoffrey Kagen

(1998) Loss of Faith

as Henry Stokes

(1971) A Taste of Evil

as Dr. Michael Lomas

(1967) The Cool Ones

as Tony Krum

(1992) The Magical World of Chuck Jones

as Self

(1995) Last Summer in the Hamptons

as Thomas

(1997) Obsessed with Vertigo: New Life for Hitchcock's Masterpiece

as Narrator (Voice)

(1960) The Subterraneans

as Yuri Gilgoric

(1971) What's a Nice Girl Like You...?

as Albert Soames

(1974) The Elevator

as Marvin Ellis

(1971) Terror in the Sky

as Dr. Ralph Baird

(1941) This England

as Hugo

(1949) Tuna Clipper

as Alec MacLennan

(1996) Dead Man's Island

as Trevor Dunnaway

(1958) The Big Country

as Hannassey Watchman (uncredited)

(1982) Mae West

as Rene Valentine

(1991) Earth Angel

as Mr. Tatum

(1997) Audrey Hepburn: The Fairest Lady

as Self

(1948) Rocky

as Chris Hammond

(1991) Crazy About the Movies: Dennis Hopper

as Self

(1994) Heads

as Fibris Drake

(1942) Son of Fury: The Story of Benjamin Blake

as Benjamin - as a Boy

(1992) The Sands of Time

as Alan Tucker

(1992) The Naked Target

as Ernest Peabody

(1994) Meet Me in St. Louis: The Making of an American Classic

as Narrator (voice)

(1973) Miracle on 34th Street

as Dr. Sawyer

(1950) Everybody's Dancin'

as Roddy McDowall

(1949) Black Midnight

as Scott Jordan

(1967) Saint Joan

as Charles, The Dauphin

(1939) Poison Pen

as Choirboy

(1997) Walter Matthau: Diamond in the Rough

as Self

(1938) I See Ice

as Boy on train

(1988) Remo Williams: The Prophecy

as ---

(1997) Barbara Stanwyck: Straight Down The Line

as Self

(1940) Just William

as Ginger

(1952) The Steel Fist

as Eric Kardin

(1998) A Bug's Life

as Mr. Soil (voice)

(1945) Molly and Me

as Jimmy Graham

(1997) Henry Fonda: Hollywood's Quiet Hero

as Self

(1989) The Big Picture

as Judge

(1940) Saloon Bar

as Boy

(1971) Journey to Murder

as Rollo Verdew

(1994) Hart to Hart: Home Is Where the Hart Is

as Jeremy Sennet

(1992) Double Trouble

as Phillip Chamberlin

(2024) Planet of the Apes: A Milestone of Science Fiction

as Self (archive footage)

(1980) Farewell to the Planet of the Apes

as Galen

(1980) Life, Liberty and Pursuit on the Planet of the Apes

as Galen

(1980) Treachery and Greed on the Planet of the Apes

as Galen

(1938) Hey! Hey! USA

as Boy

(1979) Sitcom: The Adventures of Garry Marshall

as Chuck the Robot (voice)

(1978) The Immigrants

as Mark Levy

(1948) Macbeth

as Malcolm

(1981) The Million Dollar Face

as Derek Kenyon

(2024) Elizabeth Taylor: The Lost Tapes

as Self (archive footage)

(1991) Going Under

as Secretary Neighbor

(1940) His Brother’s Keeper

as Boy

(1997) Vincent Price: The Versatile Villain

as Self

(1980) Back to the Planet of the Apes

as Galen

(1975) Elizabeth Taylor: An Intimate Portrait

as Self

(1979) The Black Hole

as V.I.N.CENT. (voice) (uncredited)

(1980) The Memory of Eva Ryker

as MacFarland

(1989) Harold Lloyd: The Third Genius

as Self

(1969) Night Gallery

as Jeremy Evans

(1998) Something to Believe In

as Gambler

(1942) On the Sunny Side

as Hugh Aylesworth

(1976) That's Entertainment, Part II

as (archive footage)

(1998) Star Power: The Creation Of United Artists

as Narrator (voice)

(1983) This Girl For Hire

as Manfred Hayes

(1950) Big Timber

as Jimmy

(1986) GoBots: Battle of the Rock Lords

as Nuggit (voice)

(1990) The Color of Evening

as Henry Seaton

(1999) Keepers of the Frame

as Himself

(1977) Sixth and Main

as Skateboard

(1976) It's Showtime

as Self (archive footage)

(1998) Louise Brooks: Looking for Lulu

as Himself - Actor / Friend

(1969) Midas Run

as Wister

(1941) You Will Remember

as Young Bob Slater

(2000) Backstory: 'How Green Was My Valley'

as Self (archive footage)

(1988) Doin' Time on Planet Earth

as Minister

(1983) Rapunzel

as Narrator

(1958) Heart of Darkness

as Charles Marlow

(1982) Hollywood’s Children

as Self (Narrator)

(1991) Timmy's Gift: A Precious Moments Christmas

as Narrator (voice)

(2001) The Return of Captain Sinbad

as Narrator

(1993) The Evil Inside Me

as Pauly

(1997) Twentieth Century Fox: The First 50 Years

as Self

(1994) Biography: Bette Davis — If Looks Could Kill

as Self

(1979) Hart to Hart

as Dr. Peterson

(1989) Hollywood on Horses

as Self

(1983) The Wind in the Willows

as Ratty (voice)

(1939) The Outsider

as Cured Child

(1998) Beyond Titanic

as Self

(1977) The Fantastic Journey

as Dr. Jonathan Willoway

(1974) Planet of the Apes

as Galen

(1984) Murder, She Wrote

as Dr. Alger Kenyon, PHD

(1993) SWAT Kats: The Radical Squadron

as ---

(1972) The Rookies

as ---

(1979) Trapper John, M.D.

as ---

(1963) Kraft Suspense Theatre

as Robert 'Professor' Benson

(1986) Matlock

as ---

(1966) Batman

as The Bookworm

(1994) Gargoyles

as ---

(1979) Buck Rogers in the 25th Century

as Governor Saroyan

(1980) The Martian Chronicles

as Father Stone

(1958) Naked City

as Donnie Benton

(1962) The Merv Griffin Show

as Self

(1991) The Pirates of Dark Water

as Niddler (voice)

(1982) Hotel

as ---

(1982) Tales of the Gold Monkey

as "Bon Chance" Louie

(1963) Arrest and Trial

as ---

(1996) Superman: The Animated Series

as Mad Hatter (voice)

(1982) Faerie Tale Theatre

as Narrator (voice)

(1975) Wonder Woman

as Henry Roberts

(1953) General Electric Theater

as Leprechaun

(1966) Mission: Impossible

as ---

(1997) The New Batman Adventures

as Mad Hatter (voice)

(1951) Hallmark Hall of Fame

as ---

(1959) The Twilight Zone

as Sam Conrad

(1967) Ironside

as ---

(1989) Camp Candy

as ---

(1966) Felony Squad

as ---

(1974) Harry O

as ---

(1965) Run for Your Life

as Gyula Bognar

(1974) Police Woman

as ---

(1977) The Fantastic Journey

as Dr. Jonathan Willoway

(1968) Journey to the Unknown

as ---

(1950) Lux Video Theatre

as Pete

(1970) McCloud

as ---

(1980) Here's Boomer

as ---

(1989) The New Lassie

as ---

(1955) Matinee Theater

as ---

(1961) Ben Casey

as ---

(1975) Ellery Queen

as ---

(1992) MGM: When the Lion Roars

as ---

(1950) Robert Montgomery Presents

as Gerald Forbes

(1973) The American Film Institute Salute to ...

as Self

(1979) Sweepstakes

as ---

(1978) Flying High

as ---

(1986) Bridges to Cross

as ---

(1977) The Rhinemann Exchange

as Bobby Ballard

(1985) Alice in Wonderland

as March Hare

(1991) An Inconvenient Woman

as Cyril Rathbone

(1985) Hollywood Wives

as Jason Swandle

(1989) Nightmare Classics

as Inspector Amos

(1992) Batman: The Animated Series

as Mad Hatter (voice)

(1971) Columbo

as Roger Stanford

(1984) Murder, She Wrote

as Gordon Fairchild

(1970) Night Gallery

as Jeremy Evans

(1995) Pinky and the Brain

as Snowball (voice)

(1962) The Tonight Show Starring Johnny Carson

as Self

(1989) Around the World in 80 Days

as McBaines

(1989) Quantum Leap

as Edward St. John V

(1950) Lux Video Theatre

as Bellamy Partridge

(1998) Godzilla: The Series

as ---

(1950) Robert Montgomery Presents

as Pip

(1948) The Ed Sullivan Show

as Self

(1962) The Alfred Hitchcock Hour

as George

(1968) The Name of the Game

as Philip Saxon

(1997) The New Batman Adventures

as The Mad Hatter / Jervis Tetch (voice)

(1979) Hart to Hart

as Dr. Peterson

(1951) Hallmark Hall of Fame

as Ariel

(1951) Hallmark Hall of Fame

as The Dauphin

(1994) Burke's Law

as Maurice Gillette

(1986) The Wizard

as ---

(1971) Great Performances

as Self

(1969) Love, American Style

as Howard

(1991) The Legend of Prince Valiant

as ---

(1967) The Carol Burnett Show

as Self - Guest

(1967) The Carol Burnett Show

as Self - Guest / Various Characters

(1967) The Invaders

as Lloyd Lindstrom

(1977) The Love Boat

as Fred Beery

(1968) The Name of the Game

as Early McCorley

(1990) Dream On

as Bob Jeffers

(1973) Barnaby Jones

as Stanley Lambert

(1963) Bob Hope Presents the Chrysler Theatre

as Arthur Biddle

(1973) The Snoop Sisters

as Lionel Standish

(1957) Suspicion

as ---

(1962) The Alfred Hitchcock Hour

as Gerald Musgrove

(1963) The Danny Kaye Show

as Self

(1947) Kraft Television Theatre

as Mr. Elton

(1944) Golden Globe Awards

as Self