Shorts from "The New Adventures of Mighty Mouse and Heckle and Jeckle" Saturday morning cartoon show edited together into a movie. Space cat villain Harry the Heartless holds space mouse Queen Pureheart. Only Mighty Mouse can save her.
| Visual Effects | Milton Gray | Animation |
| Directing | Ed Friedman | Director |
| Directing | Lou Kachivas | Director |
| Directing | Marsh Lamore | Director |
| Directing | Gwen Wetzler | Director |
| Directing | Kay Wright | Director |
| Directing | Louis Zukor | Director |
| Production | Norm Prescott | Producer |
| Production | Lou Scheimer | Producer |
| Sound | Ray Ellis | Music |
| Sound | Norm Prescott | Music |
| Crew | R.W. Pope | Cinematography |
| Editing | Earl Biddle | Editor |
| Editing | Jim Blodgett | Editor |
| Editing | Ann Hagerman | Editor |
| Production | Don Christensen | Producer |
| Writing | Sam Simon | Writer |
| Writing | Buzz Dixon | Writer |