A Christmas special about a world-class mystery-writing mouse who spends Christmas Eve with his sleuthing partners tracking down a missing Santa. The special combines live-action footage with an animated character, Alex the mouse.
| Actor | Role |
|---|---|
 Darcy MartaJill Roberts | Jill Roberts |
 Dinah GastonAmy | Amy |
| BBobby BeckenStevie Mumford | Stevie Mumford |
 Francis DambergerJerry Cole | Jerry Cole |
 Dick Van PattenSanta Claus | Santa Claus |
 Donald O'ConnorAlex the Mouse (voice) | Alex the Mouse (voice) |
 Laura PressMartine Hatcher | Martine Hatcher |
 Lloyd BochnerSam Hall | Sam Hall |