Aldo Ray as Matt Kirk

Heather Sears as Ann Fulton

Neil McCallum as Johnny Kirk

Victor Maddern as Bert

Carlo Giustini as Luke (as Carlo Justini)

Alan Tilvern as Superintendent Hanna

Barbara Mullen as Mrs. Fulton

Gerry Duggan as Pat Fulton

Kenneth J. Warren as Police Commissioner (as Kenneth Warren)

Grant Taylor as Constable Macey

Deryck Barnes as Sergeant Drake (as Derek Barnes)

Richard Vernon as Under Secretary

Ewan MacDuff as Naval Captain (as Ewan Macduff)

Martin Boddey as Brigadier

Max Robertson as Motorcycle Policeman

John Pusey as Small Boy

Fred Abbott as Constable

Peter Bathurst as Attorney General