Guest Stars Donald Sumpter as Commander Ridgeway Stanley McGeagh as Castle Guard Drew Alec Wallis as Ldg. Telegraphist Bowman Terry Walsh as Castle Guard Barclay Hugh Futcher as Hickman Royston Tickner as Robbins Peter Forbes-Robertson as Chief Sea Devil Martin Boddey as Walker Neil Seiler as Radio Operator Brian Justice as Castle Guard Wilson Colin Bell as C.P.O. Summers Eric Mason as C.P.O. Smedley John Caesar as C.P.O. Myers Rex Rowland as A/B Girton June Murphy as 3rd Officer Jane Blythe Christopher Wray as Ldg. Seaman Lovell Norman Atkyns as Rear Admiral Pat Gorman as Sea Devil Edwin Richfield as Captain Hart Clive Morton as Trenchard Brian Vaughan as Lt. Commander Watts David Griffin as Lt. Commander Mitchell Declan Mulholland as Clark
