"A successful professor has his life disrupted by a secret from his past — in his college days he became a member of a powerful secret society, and now the society has a job for him."
Glenn Ford
as Prof. Andrew 'Andy' Patterson
Rosemary Forsyth
as Vivian Masters Patterson
Dean Jagger
as Chad Harmon
Maurice Evans
as Harry Masters
Will Geer
as Mike Patterson
Eduard Franz
as Dr. Konstantin Horvathy
William Conrad
as Bart Harris
Robert Pine
as Phillip Dunning
William Smithers
as Dr. Jerry Fielder
Logan Field
as Thaddeus Burns
Dabney Coleman
as Agent Shepard
Scott Graham
as Weber
James McEachin
as Police Detective
Robert Clarke
as Dr. Louis Bauier (uncredited)
Lisabeth Hush
as Betty Fielder (uncredited)
Mark Roberts
as DA Avery Hazelton (uncredited)
Paul Wendkos
Director
David Karp
Producer
Writer
Hugh Benson
Executive Producer
Jerry Goldsmith
Original Music Composer
Robert B. Hauser
Director of Photography
Carroll Sax
Editor
Hoyt Bowers
Casting
William Craig Smith
Art Direction
Ray Molyneaux
Set Decoration
Constance Edney
Costume Design
Richard Egan
Lou LaCava
Makeup Artist
Gale McGarry
Hairstylist
Edward O. Denault
Production Manager
Michael S. Glick
Unit Production Manager
Kurt Neumann
Assistant Director
Jerry Kosloff
Sound Mixer
Morton Stevens
Music Supervisor