• Entertaining thriller set in a remote Arctic scientific base where strange goings on cause the crew (Culp & Wallach) to suspect they're not alone, though Wallach is initially unwilling to accept the ravings of the more pragmatic Culp causing tension to compete with their survival.

    Apart from Michael C.Gwynne who appears briefly in the first five minutes, the film is virtually exclusively a two-man act - that is if you exclude the monkeys/chimps on whom the scientists experiment and who may know the identity of the mysterious intruder.

    Taut and suspenseful, Culp & Wallach depict their isolation and emotional disintegration convincingly albeit at different trajectories. Creepy, claustrophobic and mature time-filler demonstrates what you can achieve with solid storytelling on a network TV movie budget; well worth a look.