"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)
David Karp
Writer
Paul Wendkos
Director
Producer
William Craig Smith
Art Direction
Richard Egan
Costume Design
Kurt Neumann
Assistant Director
Lou LaCava
Makeup Artist
Ray Molyneaux
Set Decoration
Jerry Goldsmith
Original Music Composer
Constance Edney
Morton Stevens
Music Supervisor
Hoyt Bowers
Casting
Hugh Benson
Executive Producer
Carroll Sax
Editor
Robert B. Hauser
Director of Photography
Gale McGarry
Hairstylist
Michael S. Glick
Unit Production Manager
Jerry Kosloff
Sound Mixer
Edward O. Denault
Production Manager