Adm. Michael Matthews

Stuart Whitman

Acting

Brett

Robert Wagner

Acting

Lia Holmes

Rosemary Forsyth

Acting

Cmdr. Woody Patterson

Robert Colbert

Acting

Aguila

Burr DeBenning

Acting

Elena

Susana Miranda

Acting

Barton

Paul Stewart

Acting

Prof. Holmes

Whit Bissell

Acting

The President

Richard Basehart

Acting

Dr. Ziegler

Joseph Cotten

Acting

Dr. Talty

James Darren

Acting

Capt. Hunter

Sugar Ray Robinson

Acting

Quinn

Charles Dierkop

Acting

Bill Holmes

Larry Pennell

Acting

Capt. Lunderson

William Bryant

Acting

Young Officer

Robert Dowdell

Acting

Dr. Burkson

Edward G. Robinson Jr.

Acting

Blonde Woman

Sheila Allen

Acting

Gen. Putnam

Tom Drake

Acting

Tony

Johnny Lee

Acting

Sally

Glenna Sergent

Acting

Security Guard

Ray Didsbury

Acting

Triton Controller

Erik L. Nelson

Art

Scientist (uncredited)

Paul Bradley

Acting

Technician (uncredited)

Brent Dunsford

Acting

Scientist (uncredited)

George Holmes

Acting

Scientist (uncredited)

Victor Toyota

Acting