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