On screen
Cast
164 credited performers
Lloyd Bridges
Mike Nelson
William Boyett
Character not listed
Leonard Nimoy
Hoya - Saboteur
Ross Elliott
Character not listed
John Zaremba
Character not listed
Ric Marlow
Character not listed
Charles Maxwell
USCG Lieutenant
Lisa Gaye
Character not listed
Anthony George
Character not listed
Troy Melton
Charlie
Tom Brown
Character not listed
Russ Conway
Ed
Noel Drayton
Character not listed
Tyler McVey
Character not listed
John Anderson
Character not listed
Larry Hagman
Character not listed
Robert Karnes
Character not listed
King Moody
Character not listed
Robert Clarke
Character not listed
Sue Randall
Character not listed
Christopher Dark
Larry Brand /Larry Bronson
Peter Hansen
Bennett
Joe Dominguez
Juan
Michael Masters
Bill
Jim Bannon
Police Captain McMurdy
June Blair
Character not listed
Mike Road
Character not listed
John Lupton
Character not listed
Kathie Browne
Character not listed
John Marley
Character not listed
Beau Bridges
Character not listed
Terry Becker
Character not listed
Whit Bissell
Character not listed
John Lamb
Character not listed
Myron Healey
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Paul Guilfoyle
Character not listed
Paul Maxwell
Character not listed
Robert Conrad
Character not listed
William Bakewell
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George Eldredge
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Ross Martin
Character not listed
Dale Ishimoto
Character not listed
Lane Bradford
Character not listed
Gregory Gaye
Character not listed
Jeff Bridges
Character not listed
Aline Towne
Character not listed
Don Oreck
Character not listed
Harlan Warde
Character not listed
John Beradino
Character not listed
Robert Ridgely
Cougar Norris
Harry Lauter
Character not listed
Al Ruscio
Character not listed
Eric Feldary
Greg Andrews
Eugene Iglesias
Perez - Military Police
Jack Hogan
Billy Riker
Quinn K. Redeker
USCG Lt. Bob Camp
A.G. Vitanza
Pier Manager
Victor Buono
Seminard
Robert F. Simon
Prof. Aaron Halliday
Denise Alexander
Character not listed
Jack Nicholson
John Stark
Dorothy Bridges
Character not listed
Ricou Browning
Character not listed
Frank Wolff
Character not listed
Anthony Eustrel
Character not listed
Brett Halsey
Character not listed
Robert Quarry
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Grandon Rhodes
Character not listed
Peter Breck
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Herbert Anderson
Professor George Bryan
Gregg Palmer
Character not listed
Morgan Brittany
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Oscar Beregi Jr.
Character not listed
Byron Morrow
Character not listed
Abraham Sofaer
Character not listed
John Archer
Character not listed
Bernard Kates
Character not listed
Robert Gothie
Character not listed
Joe De Santis
Character not listed
Meg Wyllie
Mrs. Norris
Robert Gist
Character not listed
William Schallert
Character not listed
Connie Hines
Character not listed
Ralph Taeger
Character not listed
Gertrude Michael
Character not listed
Vitina Marcus
Character not listed
Reed Hadley
Character not listed
Anthony Caruso
Character not listed
Joyce Meadows
Character not listed
Irene Tedrow
Character not listed
Kenneth Tobey
Pete Butler
Bill Edwards
Character not listed
Ted Knight
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Mark Dana
Character not listed
Ron Hayes
Character not listed
Ken Curtis
Character not listed
Corey Allen
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Douglas Henderson
Dr. Barton
Nestor Paiva
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Jean Porter
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Keith Andes
Character not listed
Leo Gordon
Panicky Miner
Phil Arnold
Character not listed
Pamela Duncan
Character not listed
John Doucette
Louis Hale
Gene Roth
Character not listed
Leonard Mudie
Eugene Laszlo
Anna Navarro
Character not listed
Peter Leeds
Character not listed
Bill Erwin
Character not listed
Preston Hanson
Character not listed
Joi Lansing
Character not listed
Maris Wrixon
Character not listed
Willis Bouchey
Mr. Ward
William Allyn
Character not listed
Bernard Fein
Character not listed
Sal Ponti
Edward Palmer
Dan White
Character not listed
John Qualen
Character not listed
Dehl Berti
Character not listed
Maurice Dallimore
Character not listed
Mari Blanchard
Character not listed
Jack Ging
Lou James
Paul Birch
Character not listed
Paul Dixon
Character not listed
Susan Silo
Leliani
Larry Pennell
Character not listed
Walter Reed
Case Jarrett
Hank Patterson
Character not listed
Larry Thor
Character not listed
James Anderson
Character not listed
Chris Robinson
Character not listed
Don Devlin
Character not listed
Julie Sommars
Character not listed
Anne Helm
Character not listed
Ken Christy
Mr. Palmer
John Bryant
Character not listed
Kaye Elhardt
Character not listed
Bruce Dern
FBI Agent John Furillo
Nan Peterson
Norma Carter
Szabó Sándor
Bela Benedek
Gerry Gaylor
Lili Benedek
Morris Ankrum
Character not listed
Mike Steen
Sonny Kendall
Bert Williams
Bill Davies
Jana Lund
Jill Bromley
Barry Harvey
Ramone
Cyril Delevanti
Lars Anderson
Hanna Landy
Magna Androvich
Valerie Allen
Dana Perry
Mary Lawrence
Dr. Barnes
Keith Richards
Ed Romer
Edson Stroll
Julian Laubec
Nick Dimitri
George Turner
Lomax Study
Dr. Barr
Michael Whalen
Oliver Brandon
Michael Granger
Norm 'Mr. Big' Brown
Patrick Waltz
Character not listed
Lisabeth Hush
Zoë White
Douglas Fowley
Pop
Bill Catching
Frank Brand /Frank Bronson
Nelson Olmsted
Marineland Aquarium Director
Jack Harris
Jim cook
Steve Mitchell
Wilkes