Robert Powell (Gregory Wolfe), David Hemmings (Nick Rast), Carmen Duncan (Sandra Rast), Broderick Crawford (Doc Wheelan), Gus Mercurio (Mr Bergier), Alan Cassell (Mr Porter), Mark Spain (Alex Rast), Alyson Best (Alice), Sean Myers (Benny Lucas), Mary Simpson (Zoe Cayce), Bevan Lee (Mr Robinson), Neville Teede (Dr Bartholemy), Mary Mackay (Miss Edith Twist), John Frawley (Dr Lovelock), and Nita Pannell (Mabel Wheelan).