Barry Newman as Barney Duncan

Bill Kerr as Willliam Ashby

Trisha Noble as Gillian Boles

Alwyn Kurts as Jack McGinty

John Ewart as Sam O'Bannon

Bruce Spence as Towie

Willie Fennell as Old Alf

Vincent Ball as Prime Minister

Erin Pearce as Ernie Kramer

Noel Trevarthen as Kimball

Jeff Ashby as Deighton

Kevin Miles as Thurber

Carole Skinner as Sybil

Brian Blain as Dr. Durant

Sean Scully as Army Officer

Barry Donnelly as Sgt. Bolas

Bettina Welch as Mrs. Ashby

Michael Duffield as Air Vice Marshall

Rob Steele as ASIO Agent

Brian Wenzel as ASIO Agent

Norman Kaye as ASIO Agent

Danny Adcock as ASIO Agent

Ken Wayne as Fire Officer

Robert Hughes as Fletcher

Wallas Eaton as Goodman

John Beynham as Jensen

Julie McGregor as Barney's Girl

Ray Marshall as Comm. Gallagher

Tony Blackett as W/Cdr. Kinkaid

Anthony Ingersent as Canberra Contact

John Faassen as Gen. Hornsby

Howard Vernon as Doorman

Brian Anderson as Seismo Tech.

Elizabeth Crosby as Joanne

Tony Wager as Bomb Expert

Paul Bertram as Radar Tracker

Katherine Thomson as Telephonist