Robert Powell as Gregory Wolfe

David Hemmings as Nick Rast

Carmen Duncan as Sandra Rast

Broderick Crawford as Doc Wheelan

Gus Mercurio as Mr. Bergier

Alan Cassell as Mr. Porter

Mark Spain as Alex Rast

Alyson Best as Alice

Sean Myers as Benny Lucas

Mary Simpson as Zoe Cayce

Neville Teede as Dr. Barthelemy

Anne-Marie Mackay as Miss Edith Twist

John Frawley as Dr. Lovelock

Nita Pannell as Mabel Wheelan

David Hough as Mr. Jepson

Klaus Schultz as Arthur

Peter West as Godfrey

Maurie Ogden as Prison Officer

Jack Ferrari as Eli Steele

Jeremy Sims as Young Boy on Raft

Toby Amoore as Young Boy on Raft

Sebastian Hunsley as Young Boy on Raft

Julia Moody as Reporter

Leslie Wright as Mayor

Adele Cohen as Mayoress

Ramsay McLean as Broadcaster

John Brownbridge as Police Officer with Binoculars (uncredited)

Nicole Dehring as Party Hostess (uncredited)

Bevan Lee as Mr. Robinson