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.
Forrest Tucker
as Alan Brooks
Jennifer Jayne
as Sarah Pilgrim
Janet Munro
as Anne Pilgrim
Laurence Payne
as Philip Truscott
Warren Mitchell
as Prof. Crevett
Frederick Schiller
as Mayor Klein
Colin Douglas
as Hans
Andrew Faulds
as Brett
Stuart Saunders
as Dewhurst
Derek Sydney
as Wilde
Richard Golding
as First Villager
George Herbert
as Second Villager
