A United Nations investigator crosses paths with a pair of psychic sisters on his way to Trollenberg observatory in the Swiss Alps, which has been plagued by a series of mountaineer disappearances that may be related to a radioactive cloud at the mountain's south face.
Alan Brooks
Forrest Tucker
Sarah Pilgrim
Jennifer Jayne
Anne Pilgrim
Janet Munro
Philip Truscott
Laurence Payne
Prof. Crevett
Warren Mitchell
Mayor Klein
Frederick Schiller
Hans
Colin Douglas
Brett
Andrew Faulds
Dewhurst
Stuart Saunders
Wilde
Derek Sydney
First Villager
Richard Golding
Second Villager
George Herbert
First Student Climber
Jeremy Longhurst
Second Student Climber
Anthony Parker
Carl
Leslie Heritage
Fritz
Theodore Wilhelm
The Mother
Anne Sharp
The Child
Caroline Glazer
The Spotter Pilot
Garard Green
Voice of Beheaded Climber Jim
Jack Taylor
Evacuated Villager (uncredited)
Anna Cameron
Evacuating Villager (uncredited)
Thomas Foulkes
Evacuated Villager (uncredited)
Otto Friese
Stationmaster (uncredited)
Jack Hetherington
Evacuated Villager (uncredited)
Philip Johns
Mountain Rescue Stretcher Bearer (uncredited)
Reg Thomason