Mr. Roberts is a Navy officer who's yearning for battle but is stuck in the backwaters of World War II on a non-commissioned ship run by the bullying Captain Morton.

1945, on an old cargo ship somewhere deep in the Pacific ocean: Captain Morton strives to become commander, so he demands the maximum quality of work from his crew, without granting them any freedom or favors - ignoring that they're thousand of miles away from the front. In one word: he drives his crew crazy. They are near mutiny, but no-one dares to do the first step. Until Ensign Pulver plays a prank on the captain that triggers fatal consequences...