A widow deceives her late husband's mother and brothers into thinking he's still alive when she attends the yearly memorial to his drowned sister, hoping to secure his inheritance, but her cunning is no match for the demented, axe-wielding thing roaming the grounds of the family's Irish estate.
Unfortunately the movie Dementia 13 is not yet available on Disney Plus.
| Writing | Francis Ford Coppola | Writer |
| Production | Roger Corman | Producer |
| Directing | Francis Ford Coppola | Director |
| Camera | John Vicario | Camera Operator |
| Production | Eyemonn Callian | Production Assistant |
| Crew | William Joseph Bryan | Technical Advisor |
| Crew | Patrick Doyle | Other |
| Crew | Michael Purcell | Other |
| Art | Paul Julian | Title Designer |
| Crew | Jack Hill | Additional Writing |
| Camera | Michael Vines | Best Boy Grip |
| Art | Eleanor Coppola | Set Supervisor |
| Crew | Patrick Brady | Other |
| Crew | George Brady | Other |
| Sound | Ronald Stein | Music |
| Crew | Francis Ford Coppola | Stunts |
| Camera | Charles Hannawalt | Director of Photography |
| Editing | Stuart O'Brien | Editor |
| Editing | Morton Tubor | Editor |
| Art | Edward Delaney | Sculptor |
| Production | Marianne Wood | Associate Producer |
| Directing | Richard F. Dalton | Assistant Director |
| Art | Al Locatelli | Art Direction |
| Directing | Angela Wadlow | Script Supervisor |
| Editing | Donald Shebib | Assistant Editor |
| Directing | Jack Hill | Second Unit Director |
| Sound | Joseph Gross | Sound |
| Sound | Liam Saurin | Sound |
