Jackson Clark Gillis was a prolific writer for radio, television, and books, his name is attached to over 50 television series. Throughout his career, Jackson never managed to sell a cinematic screenplay; his success was confined to television shows and made-for-TV movies. Gillis had a long and extensive career as a writer, starting in radio for such shows as The Whistler, Let George Do It, and The Hedda Hopper Show, and most notably Superman, The Adventure Continues.
| Movie | Time Travelers | 1976 |
| Movie | A Stoning in Fulham County | 1988 |
| Movie | Assault on the Wayne | 1971 |
| Movie | Tarzan's Jungle Rebellion | 1967 |