Davy Kotowski is a petty officer aboard submarine HMS Wolverine. Following a rigged arm-wrestling contest, half the crew are in slings. Kotowski is then brought before the Captain, Alec McCleod for the ninth time. He is sentenced to denial of shore leave and 20 hours laundry duty, most of which he delegates to his bunkmate Chris Cheese. Kotowski then plots his revenge on Lionel Pinner and Cheese ends up having a £100 grudge darts match with Pinner on Kotowski's behalf. Meanwhile McCleod's watch ...