- Doug Jones - Dr. Carmack Imp / Sewer Imp
- Brian Steele - Hell Knight
- Yao Chin - Mac
- Robert Russell - Dr. Carmack
- Daniel York - Lt. Huengs
- Ian Hughes - Sanford Crosby
- Sara Houghton - Dr. Jenna Willits
- Blanka Jarosova - Dr. Hillary Tallman / Imp
- Vladislav Dyntera - Dr. Steve Willits
- Jaroslav Pšenicka - Dr. Thurman
- Marek Motlícek - Dr. Clay
- Petr Hnetkovský - Dr. Olsen
- Robert Nelson - Security Guard (uncredited)
- Barbara Nedeljakova - Girl at Bar (uncredited)
- Tanoai Reed - Dead Scientist Shot (uncredited)
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Fabien Ara
Capítulo disponible en las siguientes plataformas: