An old flame (Pat Crowley) of the Captain's (Gavin MacLeod) returns for a cruise. As the captain prepares to propose, Doc (Bernie Kopell) and Isaac (Ted Lange) discovers some news, which will cause the Captain some distress. Two business partners (Dick Martin and Robert Mandan) and their secretary (Phyllis Davis) are on the cruise to celebrate winning a large contract. One partner (Martin) is not as honest as he seems and tries to use his secretary's love for him to cover his underhanded tricks. In an attempt to get the attention of a woman (Lydia Cornell) he cares for, a passenger (Linwood Boomer) reports that he had been sexually attacked by an unknown female passenger in a darkened hall closet, but the woman's friend and fellow passenger (Pat Klous) is attracted to the man.