| 角色 | 饰演者 | 角色介绍 |
| Milo | 赛斯·格林 | |
| Gribble | 丹·福勒 | |
| Mom | 琼·库萨克 | |
| Ki | 伊莉莎白·哈诺伊斯 | |
| Supervisor | Mindy Sterling | |
| Wingnut | Kevin Cahoon | |
| Dad | 汤姆·艾弗瑞特·斯科特  | |
| Martian | Jacquie Barnbrook | |
| Martian | Matthew Henerson | |
| Martian | Adam Jennings | |
| Martian | Stephen Kearin | |
| Martian | Amber Gainey Meade | |
| Martian | Aaron Rapke | |
| Martian | Julene Renee | |
| Martian | Kirsten Severson | |
| Martian | Matthew Wolf | |
| Martian Hatchling | Raymond Ochoa | |
| Martian Hatchling | 罗伯特·欧乔 | |
| Martian Hatchling | 瑞恩·奥查 | |
| Martian Hatchling | Meredith Wells | |
| Martian Hatchling | Teagan Wells | |
| Voice Performer (voice) | Marianne Bennett | |
| Milo (voice) (as Seth Dursky) | Seth Robert Dusky | |
| Voice Performer (voice) | Jo McGinley | |
| Voice Performer (voice) (as Daniel James O'Conner) | Dan O'Connor | |
| Voice Performer (voice) | Edi Patterson |
