It's Popeye's birthday, and Olive Oyl invites him over and bakes him a cake. Popeye invites depressed shipmate Shorty to join them.

Popeye is doing a great job of sinking Japanese ships (complete with toilet-flush sound effect). A carrier pigeon brings him notice that he's been granted a month furlough, which he plans to spend with Olive and his nephews. But on arrival, he's run over by Olive, who immediately leaves him alone with his nephews, who are practicing home defense.

Mercury, the winged messenger, drops his sandals off with a centaur to be repaired. The centaur, who has coveted wings to the extent that he's used a couple ducks to help him fly, takes the sandals for a spin, and fails to finish the repair job on time. Mercury returns; in a panic, the centaur strips the wings from a couple birds and nails them to some plain sandals, but Mercury is not fooled. He turns the centaur into a pretzel.

Popeye induces Bluto to join the Army. Bluto is a bit reluctant at first, but the might of Popeye's fists convinces Bluto that Uncle Sam needs fighting men.

Using Clark Kent as a cover, Superman travels to Japan as a saboteur during the war.

Superman discovers a secret Nazi base in the jungle.