"A marine biologist teaches his dolphins to communicate in English but shady characters plan to kidnap the trained mammals for a more sinister purpose."
George C. Scott
as Jake Terrell
Trish Van Devere
as Maggie Terrell
Paul Sorvino
as Curtis Mahoney
John Dehner
as Wallingford
Severn Darden
as Schwinn
Elizabeth Wilson
as Mrs. Rome
William Roerick
as Dunhill
Phyllis Davis
as Receptionist
Pat Zurica
as First Mate
Jon Korkes
as David
Edward Herrmann
as Mike
Leslie Charleson
as Maryanne
Victoria Racimo
as Lana
John David Carson
as Larry
Willie Myers
as Stone
Julie Follansbee
as Women's Club
Florence Stanley
Brooke Hayward
Pat Englund
Fritz Weaver
as Harold DeMilo
Johann Benét
as Boy in Park (uncredited)
Buck Henry
as Man Standing Outside Women's Club (uncredited)
Robert Lydiard
as Alpha (voice) (uncredited)
Erick Vinther
as Patron (uncredited)
Mike Nichols
Director
Larry Jost
Sound
Michael Haley
Second Assistant Director
Edwin Butterworth
Makeup Artist
Dorothy Byrne
Hairstylist
Sam O'Steen
Editor
Richard Sylbert
Production Design
Anthea Sylbert
Costume Design
Angelo P. Graham
Art Direction
Del Acevedo
Tim Zinnemann
Production Manager
William A. Fraker
Director of Photography
Robert Merle
Novel
Thomas J. Schmidt
Assistant Director
Dick Birkmayer
Associate Producer
Screenplay
Robert E. Relyea
Producer
Georges Delerue
Original Music Composer
George R. Nelson
Set Decoration
Joseph E. Levine
Executive Producer