A priest discovers an ancient canister containing a strange liquid in an abandoned church. When a group of graduate students and scientists are tasked with studying it, they unknowingly unleash an evil force waiting to destroy all of humanity.
| Priest | Donald Pleasence |
| Catherine Danforth | Lisa Blount |
| Prof. Howard Birack | Victor Wong |
| Brian Marsh | Jameson Parker |
| Walter | Dennis Dun |
| Kelly | Susan Blanchard |
| Susan Cabot | Anne Marie Howard |
| Lisa | Ann Yen |
| Lomax | Ken Wright |
| Mullins | Dirk Blocker |
| Calder | Jessie Lawrence Ferguson |
| Dr. Paul Leahy | Peter Jason |
| Frank Wyndham | Robert Grasmere |
| Etchinson | Thom Bray |
| Bag Lady | Joanna Merlin |
| Street Schizo | Alice Cooper |
| Nun | Betty Ramey |
