| Actor | Character | Firearm | Notes |
|---|---|---|---|
| Christopher Lloyd | Professor Plum | Harrington & Richardson Model 733 | - |
| Colleen Camp | Yvette | Harrington & Richardson Model 733 | - |
| Eileen Brennan | Mrs. Peacock | Harrington & Richardson Model 733 | - |
| Howard Hesseman | The Chief | Smith & Wesson Model 10 | uncredited |
| Lesley Ann Warren | Miss Scarlett | Harrington & Richardson Model 922 | - |
| Michael McKean | Mr. Green | Smith & Wesson Model 10 | - |
| Tim Curry | Wadsworth | Harrington & Richardson Model 922 | - |