Guest Stars Ronald Fraser as Mr. Horrocks Jean Marsh as Mrs. Vanrenen Stephen Yardley as First Officer Clayton Edward Dentith as Sir Edward Markham Michael Cashman as Asst. Purser Robbins Norman Bird as Inspector Trent John Dawson as Jacobs John Tordoff as Fox John Barcroft as Gaylord Paul Hardwick as Lord Altington Lindsay Campbell as Captain Handmay Annette Kerr as Mrs. Pallin John Sterland as Shipping Clerk Douglas Blackwell as Taylor Melanie Jane as Mrs. Clayton Bill Herbert as Third Officer