Academy Award winners Henry Fonda, James Cagney and Jack Lemmon star.World War II. Across the South Pacific the war rages in acts of courage, bravery, heroism...And somewhere in becalmed tropical waters lazily steams the cargo ship U.S.S. Reliant, vital to the war effort but never seeing combat. As its crewmembers devise wacky adventures to fight boredom, the ship's lieutenant struggles to find a way to get into combat and fight for his country. But a different sacrifice will be asked of aspiring hero Mister Roberts.