Professor Samuel Hale Constable is a government expert in the field of cybernetics. He and his wheelchair-bound wife Lenore became parents late in life, only to lose their daughter Mary before she reached adolescence. Now their daughter's spirit seems to be reaching out to her grief-stricken father from beyond the grave, encouraging him to give up the important project on which he's been working.
Don Murray
as Dr. Alex Lauder
Ray Milland
as Prof. Samuel Hale Constable
Gene Tierney
as Lenore Constable
Barbara Dana
as Tina Cryder
Ed Asner
as Saul Wiener
Pamelyn Ferdin
as Mary Constable
William Beckley
as Arnold Watson Bessmer
Ivor Barry
as Dr. Paul Cryder
George Macready
as Dr. Frank Ferguson
John Carradine
as Mr. Bosch
Virginia Christine
as Helga
Cecile Ozorio
as Devi Bessmer
