The plot: Ah, so familiar to all of us! Everyone of us can so relate to how this movie begins. We all have our stories of touring Switzerland by train and sharing our cabin with two women who comprise a touring psychic act. Alan Brooks (Tucker) is an American scientist voyaging to the Trollenberg Mountain to study increased radiation levels. The sisters are forced to depart the train at Trollenberg when the younger one has some mysterious psychic reaction when the Trollenberg Mountain becomes visible. A radioactive cloud has descended on the mountain and climbers, venturing into the cloud are subsequently decapitated. In a classic scene, something (which ends up being a giant tentacled eye) decapitates a mountaineer and casts him off the mountain. As the headless body is falling, it is screaming "Ahhhhhhhh!!!."
I have it from a reliable source that Shania Twain made up her mind to move to Switzerland after she saw this movie. This is classic 1950s sci-fi. The eye creatures are creepy, and the scenery is beautiful even though it was filmed in a London studio. Forrest Tucker is perfect as the tall, square jawed hero. If Stanley Kubrick's, Barry Lyndon, did not excite you, see The Crawling Eye.