A young boy, who dreams of meeting the grandfather he never knew gets his chance, when an inventor friend constructs a time machine. After arriving in the past, it soon becomes apparent that his knowledge of the future could change the course of history.
| Actor | Role |
|---|---|
 Peter CoyoteMax Knickerbocker | Max Knickerbocker |
 Huckleberry FoxJonathan Knicks | Jonathan Knicks |
 Art CarneyHenry Coogan | Henry Coogan |
 Dennis LipscombFinch | Finch |
 Joe FloodLeary | Leary |
| MMittie SmithHelen Knickerbocker | Helen Knickerbocker |
| FFrank SimonsYoung Coogan | Young Coogan |
| SStu KlitsnerMr. Knicks | Mr. Knicks |
 Morgan UptonPolice Captain | Police Captain |
| SStephen PriorLittle League Boy | Little League Boy |
| BBennett CaleDooley | Dooley |
| CCyril ClaytonDrunk | Drunk |
| CCharles AdamsNewsstand Man | Newsstand Man |
| GGretchen GrantMrs. Knicks | Mrs. Knicks |
| DDoug MorrisonBarber | Barber |
| JJerry LandisDoctor | Doctor |
| FF. Jo MohrbachNurse (as Jo Mohrbach) | Nurse (as Jo Mohrbach) |
| EEric BarnesRadio Announcer | Radio Announcer |
| AArt SchollFinch's Pilot | Finch's Pilot |
 Scott DevenneyScott DeVenney | Scott DeVenney |
| RRick KuhnDead Pilot (uncredited) | Dead Pilot (uncredited) |