(1973) Papillon

as Lariot

(2007) Holly Hobbie and Friends: Surprise Party

as Bud Morris (voice)

(2006) A.I. Assault

as Major Keith

(1990) Captain America

as Young General Fleming

(1961) Tammy Tell Me True

as Neil Bateman

(1995) Three Wishes

as Neighbor

(2023) Babylon 5: The Road Home

as Lennier (voice)

(1969) Rascal

as Sterling North

(2000) Behind The Dementia

as himself

(1971) Bless the Beasts & Children

as Lawrence Teft

(1998) Lost In Space Forever

as Self (also archive footage)

(1999) Attack of the 50 Foot Monster Mania

as Narrator

(1984) Hard to Hold

as The James Roberts Band - Keyboard

(2009) The Face is Familiar

as Narrator

(2002) Larry 'Wild Man' Fischer

as Self

(1983) Twilight Zone: The Movie

as Tim

(1965) Dear Brigitte

as Erasmus 'Ras' Leaf

(1963) A Ticklish Affair

as Alex Martin

(2006) Holly Hobbie and Friends: Christmas Wishes

as Bud Morris / Judge #1 (voice)

(1992) Double Trouble

as Bob

(2024) Space Command Redemption

as Greg Mazzey

(1968) Wild in the Streets

as Boy

(1962) Sammy, the Way-Out Seal

as Petey Loomis

(1963) A Child Is Waiting

as Child

(1961) The Wizard of Baghdad

as Aladdin

(1977) Sunshine Christmas

as Weaver

(1973) Sunshine

as Weaver

(1963) Palm Springs Weekend

as Boom Boom Yates

(2006) Look, Up in the Sky! The Amazing Story of Superman

as Self

(2018) What We Left Behind: Looking Back at Star Trek: Deep Space Nine

as Self

(1964) For the Love of Willadean

as Freddy Gray

(1965) Lost in Space - No Place to Hide

as Will Robinson

(2005) Derailroaded

as Self

(2005) Ringers: Lord of the Fans

as Self

(1996) Underground Adventure

as Sam (voice)

(1996) The Monkey Prince

as Sam (voice)

(1974) The Rockford Files

as Nick Butler

(2004) Comic Book: The Movie

as Bill Mumy

(1987) Zabagabee

as Art Barnes

(1991) The Ren & Stimpy Show

as ---

(1997) The Weird Al Show

as ---

(1965) I Dream of Jeannie

as Custer

(1986) Matlock

as ---

(1964) The Munsters

as ---

(2001) Crossing Jordan

as Paper Shredder Operator

(1959) The Twilight Zone

as Billy Bayles

(1959) The Twilight Zone

as Anthony Fremont

(1985) The New Alfred Hitchcock Presents

as Supermarket Clerk

(1994) Space Ghost Coast to Coast

as ---

(1993) Diagnosis: Murder

as Parker Craddick

(1965) Lost in Space

as Will Robinson

(1994) Babylon 5

as Lennier

(1957) Perry Mason

as Miles

(1964) Bewitched

as Michael

(1975) Sunshine

as Weaver

(1953) General Electric Theater

as Buzz

(1988) Superboy

as ---

(1959) The Twilight Zone

as Young Pip

(1955) Alfred Hitchcock Presents

as Jackie Chester

(1963) The Greatest Show on Earth

as ---

(1962) Going My Way

as ---

(1962) The Eleventh Hour

as ---

(1963) The Fugitive

as David Taft

(1962) The Virginian

as Willy

(1968) Lancer

as ---

(1960) National Velvet

as ---

(1961) Ben Casey

as ---

(1963) Vacation Playhouse

as Chris Williams

(1961) Dr. Kildare

as Jeffey

(1953) Letter to Loretta

as Rennie

(1961) Kraft Mystery Theatre

as ---

(1992) Batman: The Animated Series

as The Fox (voice)

(2001) TVography

as ---

(2002) The Twilight Zone

as Anthony Fremont

(2012) Bravest Warriors

as Ralph Waldo Pickle Chips

(1994) The Steven Banks Show

as Billy Mumy

(2006) Holly Hobbie & Friends

as Bud Morris (voice)

(2010) Ben 10: Ultimate Alien

as Agent Bryson (voice)

(1954) The Wonderful World of Disney

as Petey Loomis

(1957) Wagon Train

as Toddy

(1953) Letter to Loretta

as Jimmy Harrison

(1996) Space Cases

as ---

(1990) The Flash

as Roger Braintree

(2018) Lost in Space

as Real Dr. Smith

(1955) Alfred Hitchcock Presents

as Mickey Hollins

(1974) The Rockford Files

as Nick Butler

(1974) The Rockford Files

as Trask

(2000) Buzz Lightyear of Star Command

as Eon (voice)

(1950) The Jack Benny Program

as Little Boy Who Weighs Himself

(2002) What's New, Scooby-Doo?

as Harry Noze (voice)

(1993) Star Trek: Deep Space Nine

as Kellin

(1954) The Wonderful World of Disney

as Freddy Gray

(2016) The Loud House

as Timothy Mccole

(2018) Lost in Space

as Dr. Zachary Smith

(1962) The Alfred Hitchcock Hour

as Tony Mitchell

(2024) The D-Con Chamber

as Self

(2021) Toon In with Me

as Self