Stephen Murray as Lieut. Murray, the No. 1
Jon Pertwee as Chief Petty Officer Pertwee
Leslie Phillips as Sub-Lieut. Phillips
Richard Caldicot as Commander
Povey Heather Chasen as Heather with assistance from Michael Bates
Ronnie Barker. Tenniel Evans
, Script by Laurie Wyman
Production by Alastair Scott Johnston