| Will Marshall (43 episodes 1974-1976) | Wesley Eure | |
| Holly Marshall (43 episodes 1974-1976) | Kathy Coleman | |
| Cha-Ka (43 episodes 1974-1976) | Philip Paley | |
| Park Ranger Rick Marshall (30 episodes 1974-1975) | Spencer Milligan | |
| Uncle Jack (13 episodes 1976) | 朗·哈珀
 | |
| Sleestak (8 episodes 1976) | Bill Boyd | |
| Enik? (6 episodes 1974-1976) | Walker Edmiston | |
| Sleestak (6 episodes 1974-1975) | Jack Tingley | |
| Sleestak (5 episodes 1974-1975) | Mike Westra | |
| Sleestak (4 episodes 1974-1975) | Scott Fullerton | |
| Sleestak (3 episodes 1974) | Bill Laimbeer | |
| Keith Katt? (2 episodes 1974-1976) | Rooney Kerwin | |
| Ta (2 episodes 1974-1975) | Joe A. Giamalva | |
| Sa (2 episodes 1974) | Sharon Baird | |
| Mrs. Marshall? (2 episodes 1974) | Erica Hagen | |
| Abominable Snowman (1 episode 1976-1977) | Jon Locke | |
| Ta (unknown episodes 1975-1977) | Scutter McKay | |
| Sleestak (unknown episodes) | Cleveland Porter | |
