| Movie | UFO Invasion at Rendlesham | Self - Co-Author, Left at East Gate | 2026 |
| Movie | Alien Abduction: A True Story | Self | 2018-06-01 |
| Movie | The Making of 'A Charlie Brown Christmas' | Self | 2001-12-06 |
| Movie | Mirrorball | Jackie's Fan 2 | 2000-12-22 |
| Movie | Muppet Treasure Island | Additional Muppet Performer | 1996-02-16 |
| Movie | The Muppet Christmas Carol | Additional Muppet Performer (voice) | 1992-12-11 |
| Movie | A Charlie Brown Thanksgiving | Charlie Brown's screaming voice (voice) (uncredited) | 1973-11-20 |
| Movie | It Was a Short Summer, Charlie Brown | Charlie Brown | 1969-09-27 |
| Movie | A Boy Named Charlie Brown | Charlie Brown (voice) | 1969-12-04 |
| Movie | He's Your Dog, Charlie Brown | Charlie Brown | 1968-02-14 |
| Series | Blondie | Alexander Bumstead | 1968-09-26 |
| Movie | Good Times | Brandon | 1967-04-11 |
| Movie | You're in Love, Charlie Brown | Charlie Brown (voice) | 1967-06-12 |
| Movie | Moment to Moment | Timmy Stanton | 1966-01-27 |
| Movie | Charlie Brown's All-Stars! | Charlie Brown (voice) | 1966-06-08 |
| Movie | It's the Great Pumpkin, Charlie Brown | Charlie Brown (voice) | 1966-10-27 |
| Series | Love on a Rooftop | Unknown | 1966-09-06 |
| Movie | Noon Wine | Herbert | 1966-11-23 |
| Series | ABC Stage 67 | Unknown | 1966-09-14 |
| Series | F Troop | Unknown | 1965-09-14 |
| Movie | A Charlie Brown Christmas | Charlie Brown (voice) | 1965-12-09 |
| Series | Get Smart | Unknown | 1965-09-18 |
| Series | The Munsters | Elmer | 1964-09-24 |
| Movie | A Boy Named Charlie Brown | Charlie Brown (voice) | 1963-12-31 |
| Series | Vacation Playhouse | Unknown | 1963-07-22 |
| Movie | A Ticklish Affair | Grover Martin | 1963-08-18 |
| Series | My Three Sons | Unknown | 1960-09-29 |