| Credited cast: |
 | Rocky Nelson | - | Rock Ogre / Narrator / Mad Doctor / Detective Rock / Several Victims |
| Rest of cast listed alphabetically: |
 | Forrest J. Ackerman | - | Man attacked by the Devil Ant at 'The Monster Bash Convention' |
 | Conrad Brooks | - | Man killed by the Ant from Hell |
 | Hillary Clinton | - | Hillary Clinton |
 | Roger Corman | | |
| Richard T. Crowe | | |
| Michael Flores | | |
 | Karl Hardman | | |
 | S. William Hinzman | - | (as Bill Hinzman) |
 | Rich Koz | - | Svengoolie (as Svengoolie) |
| Matter | - | Rockband |
 | Fred Olen Ray | | |
| John Russo | | |
 | John A. Russo | - | (as John Russo) |
 | Tom Savini | | |
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