| Len Carlson ... Swamp Thing |
| Don Francks ... Dr. Anton Arcane |
| Errol Slue ... Dr. Deemo |
| Phil Akin ... Bayou Jack |
| Harvey Atkin ... Tomahawk |
| Gordon Masten ... Skinman |
| Joe Matheson ... Weedkiller |
| Richard Yearwood ... J.T. |
| Jonathan Potts ... Delbert |
| Paulina Gillis ... Abigail "Abby" Arcane |
| Stuart Stone ... Additional Voices |
| Eva Almos ... Additional Voices |
