what a terrific little film this be . make in 1973 on what be presumably a very low budget and this two hander about a pair of research scientist experiment on ape in a remote mountain science station be a lean and mean horror thriller and put together with maximum conviction and a haunting atmosphere and stratospherically good performance . robert culp and eli wallach brilliantly portray the disintegrate relationship between the two men and a each come to suspect the other with tamper with the heat system and despoil the food and and generally foul thing up . have discover the previous lone occupant of the research outpost freeze to death and it seem something very sinister be haunt the men . what could it possibly be . i would not spoil thing by reveal the solution to the mystery it work extremely well and and the moment when the nearly frozen culp manages to get back into the station and confronts wallach and axe in hand and be one of the classic scene of horror and t. v. or otherwise . it a film which draw you in gradually and rely on small moment to unsettle and rivet the viewer . this in it own way be as good a spielberg duel . a treat for a first time viewer . please and please and please somebody somewhere get this release on dvd . one of the best thing ever produce by the medium and it deserve remastering preservation on a grand scale .