The Trollenberg Terror
OOn the Swiss mountain Trollenberg, one of three student climbers is suddenly killed, his head ripped from his body.
Two sisters, Anne (Munro) and Sarah Pilgrim (Jayne), a London mind-reading act, are travelling by train to Geneva when Anne faints as the train passes the mountain. Upon waking, Anne insists that they must get off at the next stop.
UN troubleshooter Alan Brooks (Tucker), in the same train compartment as the sisters, goes to Trollenberg’s observatory, where Professor Crevett (Warren Mitchell) explains that, despite many climbing accidents, no bodies are ever found.
An always-stationary radioactive cloud is regularly observed on the mountain’s south face. Brooks learns that similar incidents took place in the Andes three years earlier, before a similar radioactive cloud vanished without a trace. Local rumours circulated that something was living in the mist.