Despite the title this is really not a monster on the rampage horror movie that you might expect from Hammer. Writer Nigel Kneale goes for quirky science and director Val Guest adds atmospheric direction on a low budget in this spooky thriller.
Peter Cushing is principled botanist John Rollason searching for evidence of the Yeti in the Himalayas with an expedition team that includes dodgy Forrest Tucker who is more like a sinister Barnum type showman looking for monetary gain by capturing a Yeti.
The creature is very much kept off screen for a lot of the time as Kneale explores humanity's darker side as represented by the likes of Tucker. It is suggested that the Yeti are gentle, intelligent beings from a superior civilisation that one day will take over from humans and Rollason does not view them as monsters.
The film has a moral message aimed at perils of human greed and its penchant for destruction.