Directed by
| Joseph Barbera | ||
| William Hanna | ||
Writing Credits (in alphabetical order)
| Eddie Brandt | ... | (story) |
| Phil Hahn | ... | (story) |
| Jack Hanrahan | ... | (story) |
| Michael Maltese | ... | (story) |
Cast
 |
Dick Beals | ... | Buzz Conroy (voice) |
| Ted Cassidy | ... | Frankenstein, Jr. (voice) | |
| June Foray | ... | Mother Gruesome (voice) | |
| Paul Frees | ... | Fluid-Man / Big D / Narrator (voice) | |
|
|
Don Messick | ... | Multi-Man / Cromwell (voice) |
| Hal Smith | ... | Coil-Man (voice) | |
| John Stephenson | ... | Professor Conroy (voice) | |
Produced by
| Joseph Barbera | ... | producer |
| William Hanna | ... | producer |
Animation Department
| Charles Nichols | ... | animation director (as Charles A. Nichols) |
| Alex Toth | ... | character designer |