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| Boris Karloff | Baron Boris von Frankenstein | |
| Allen Swift | Felix Flankin / Yetch / Dracula / Invisible Man / Dr. Jekyll / Mr. Hyde / Additional Voices | |
| Gale Garnett | Francesca | |
| Phyllis Diller | The Monster's Mate | |
| Ethel Ennis | Title Song Singer | |
| Alan Swift | Felix Flankin / Yetch / Dracula / Invisib | 
| Director | 
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| Producer | Jules Bass Arthur Rankin | ||
| Writer | Arthur Rankin Jr. Len Korobkin | ||
| Cinematography | Tadahito Mochinaga | ||
| Musician | Maury Laws | 
|  | When Dr Frankenstein decides to retire from the monster-making business, he calls an international roster of monsters to a creepy convention to elect his successor. Everyone is there including Dracula, The Werewolf, The Creature, Dr Jekyll & Mr Hyde and many more. But Frankenstein's title is not all that is at stake. The famous doctor has also discovered the secret of total destruction that must n | 
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