| Year | Film/Television | Role | Notes |
| 1960 | The Tom Ewell Show | Jeffrey Nelson | Season 1 Episode 5: "Tom Puts the Girls to Work" |
| 1961 | The Twilight Zone | Billy Bayles | Season 2 Episode 22: "Long Distance Call" |
| 1961 | The Twilight Zone | Anthony Fremont | Season 3 Episode 8: "It's a Good Life" |
| 1961 | Alfred Hitchcock Presents | Jackie Chester | Season 7 Episode 2: "Bang, You're Dead" |
| 1962 | Alfred Hitchcock Presents | Mickey Hollins | Season 7 Episode 15: "The Door Without a Key" |
| 1962 | The Alfred Hitchcock Hour | Tony Mitchell | Season 1 Episode 8: "House Guest" |
| 1962 | Walt Disney's Wonderful World of Color | Petey Loomis | Episode: "Sammy, the Way-Out Seal" |
| 1962 | The Jack Benny Program | 34-Lb Boy | Season 13 Episode 12: "Jack and the Crying Cab Driver" |
| 1962 | Wagon Train | Toddy | Season 6 Episode 15: "The Sam Darland Story" |
| 1963 | The Twilight Zone | young Pip Phillips | Season 5 Episode 1: "In Praise of Pip" |
| 1963 | A Child Is Waiting | Boy counting Jean's pearls | |
| 1963 | A Ticklish Affair | Alex Martin | |
| 1963 | Palm Springs Weekend | 'Boom Boom' Yates | |
| 1963 | Perry Mason | Miles Jefferson | Season 7 Episode 2: "The Case of the Shifty Shoebox" |
| 1964 | Bewitched | Michael (Orphan Boy) | Season 1 Episode 15: "A Vision of Sugar Plums" |
| 1964 | The Adventures of Ozzie and Harriet | Billy | Season 13 Episode 2: "Rick's Old Printing Press" |
| 1964 | The Adventures of Ozzie and Harriet | Billy | Season 13 Episode 7: "The Pennies" |
| 1964 | The Adventures of Ozzie and Harriet | Billy | Season 13 Episode 8: "The Ballerina" |
| 1965 | Bewitched | Darrin | Season 2 Episode 10: "Junior Executive" |
| 1965 | The Virginian | Willy | Season 3 Episode 28: "Old Cowboy" |
| 1965 | Dear Brigitte | Erasmus 'Ras' Leaf | |
| 1965 | I Dream of Jeannie | Custer | Season 1 Episode 11: "Whatever Became of Baby Custer?" |
| 1965 | The Munsters | Googie Miller | Season 1 Episode 25: "Come Back Little Googie" |
| 1965–68 | Lost in Space | Will Robinson | 84 episodes |
| 1968 | Wild in the Streets | Boy | Uncredited |
| 1969 | Rascal | Sterling North | |
| 1969 | Lancer | Andy Cutler | Season 2 Episode 3: "The Kid" |
| 1970 | Here Come the Brides | Simon Bill | Season 2 Episode 15: "Break the Bank of Tacoma" |
| 1971 | Bless the Beasts and Children | Teft | |
| 1973 | Papillon | Lariot | |
| 1974 | The Rockford Files | Nick Butler | Season 1 Episode: "Backlash of the Hunter" (pilot) |
| 1975 | The Rockford Files | Trask | Season 1 Episode 14: "Aura Lee, Farewell" |
| 1975 | Sunshine | Weaver | 15 episodes |
| 1983 | Twilight Zone: The Movie | Tim (Segment ) | |
| 1984 | Hard to Hold | Keyboard Player | |
| 1988 | Matlock | Dr. Irwin Bruckner | Season 2 Episode 20: "The Genius" |
| 1990 | Captain America | Young General Fleming | |
| 1991 | The Flash | Roger Braintree | Season 1 Episode 19: "Good Night, Central City" |
| 1991 | Superboy | Tommy Puck | Season 4 Episode 1: "A Change of Heart, Part 1" |
| 1991 | Superboy | Tommy Puck | Season 4 Episode 2: "A Change of Heart, Part 2" |
| 1992 | Superboy | Tommy Puck | Season 4 Episode 19: "Obituary for a Super Hero" |
| 1992 | Double Trouble | Bob | |
| 1993 | Ultraman: The Ultimate Hero | Fenton | Season 1 Episode 5: "Monstrous Meltdown" |
| 1994 | Animaniacs | The Farmer | Voice, Season 1 Episode 62: "Witch One" |
| 1994 | The Ren & Stimpy Show | Dr. Brainchild | Voice, Season 4 Episode 3: "Blazing Entrails" |
| 1994–98 | Babylon 5 | Lennier | 109 episodes |
| 1995 | Batman: The Animated Series | Warren Lawford / Fox | Voice, Season 4 Episode 1: "The Terrible Trio" |
| 1996 | The Oz Kids | Sam | Voice |
| 1997 | The Weird Al Show | UPS Guy | Season 1 Episode 4: "Back to School |