Kurt Russell plays R.J. MacReady, the helicopter pilot and de facto leader of the group who leads the fight against the deadly alien threat.
Keith David portrays Childs, one of the researchers at the Antarctic base who becomes a key player in the intense battle for survival.
Wilford Brimley is Blair, the senior biologist at the outpost who becomes increasingly paranoid as the situation escalates.
T.K. Carter plays Nauls, one of the outpost's cooks, who must confront the terrifying alien force alongside his colleagues.
David Clennon portrays Palmer, a geologist at the research facility who faces the deadly alien threat head-on.
Richard Dysart is Dr. Copper, the camp physician who plays a crucial role in trying to contain the alien menace.
Charles Hallahan plays Norris, one of the outpost's researchers who finds himself in a life-and-death struggle against the alien intruder.
Peter Maloney portrays Bennings, a meteorologist stationed at the Antarctic base who must confront the shape-shifting alien threat.
Richard Masur is Clark, one of the dog handlers at the outpost who becomes embroiled in the fight for survival against the deadly entity.
Donald Moffat plays Garry, the commander of the Antarctic research outpost who must make tough decisions to protect his team from the alien threat.
Joel Polis portrays Fuchs, the station's assistant biologist who works tirelessly to understand and combat the lethal extraterrestrial menace.
Thomas G. Waites plays Windows, one of the mechanics stationed at the Antarctic outpost who must face the terrifying reality of an alien infiltrator.
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