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