Guest Stars Donald Sumpter as Commander Ridgeway John Caesar as C.P.O. Myers Brian Justice as Castle Guard Wilson Eric Mason as C.P.O. Smedley David Griffin as Lt. Commander Mitchell Peter Forbes-Robertson as Chief Sea Devil Martin Boddey as Walker Neil Seiler as Radio Operator Alec Wallis as Ldg. Telegraphist Bowman Colin Bell as C.P.O. Summers Rex Rowland as A/B Girton 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 Brian Vaughan as Lt. Commander Watts Royston Tickner as Robbins Hugh Futcher as Hickman Declan Mulholland as Clark
