The crew of the USS Reluctant is at it again in this comedy sequel to Mister Roberts. The story opens toward the end of WWII as the great ship drops her cargo at various island bases. Their captain is an unbending tyrant. Young Pulver aspires to become a doctor just like his hero and mentor, the ship's physician. A terrible storm erupts and the ruthless captain is knocked overboard by a rogue wave. Brave Pulver dives over to save the commander and together the two end up stranded on a deserted island. When the captain suddenly doubles over with appendicitis it is up to Pulver to save him via a radio and the ship's doctor's instructions. Fortunately, it all comes out well in the end.