Although Dirk Bogarde at this stage of his career was looking for meatier dramatic roles, like Sean Connery for a time he was cast as the likable if sometimes ineffectual Dr. Simon Sparrow for a series of films of which this is the second one. They were moneymakers for the Rank Organisation to be sure and Bogarde got a lot of popularity from them.
After that first film in which he completes his residency, Dr. Sparrow sets up his practice. But when he's both called on to do the work of his older colleague and resist the amorous advances of his less than tempting daughter, Bogarde decides to get away from it all. What better than to take a birth as a ship's doctor on a cargo freighter that does have some passenger accommodations.
Of course when he gets on the HMS Lotus he finds that it's like he never left the United Kingdom when he discovers that the captain is none other than James Robertson Justice. JRJ played the head of the hospital in the first Dr. Sparrow film and was the bane of Bogarde's existence. He's playing the same kind of tyrannical character in this film as the captain from the Bligh School of Command. Or better yet JRJ is like Captain Morton from Mister Roberts.
The compensation is that on the return voyage Brigitte Bardot is a passenger. But on the voyage going and coming back is the daughter of the ship's owner Brenda DaBanzie and she's setting a romantic cap for for the Captain the kind that Bogarde ran to sea to get away from.
Bogarde is shy and sweet and sometimes ineffectual, but he does come through in several of the crises aboard ship. The film holds up well still for today's audience.