Charles Winninger plays an old seaman who rules the roost in his family, which resides on a Florida houseboat. His oldest granddaughter (Anne Baxter) draws up plans to invite a serviceman for Sunday dinner, just before the boy will be shipped out. Because of their ramshackle lifestyle, Winninger's brood has trouble getting a soldier to accept their hospitality until lonely, defensive GI John Hodiak comes along. Nothing much happens thereafter that isn't totally expected, including Hodiak's changing his outlook on life and falling in love with the granddaughter. Sunday Dinner for a Soldier is the sort of laid-back, anecdotal film that was indigenous to Hollywood's "feel-good" brand of wartime entertainment.