Snafu annoys his fellow soldiers by listening to loud swing music and banging pots and pans in rhythm. The other soldiers at the barracks are busy studying maps, field manuals, and air recognition charts. Snafu dismisses their interest in studying, and claims he is not going to clunk the enemy over the head with books.

Tenants of a Harlem boarding house put on a show to save their home.

Gaira, a humanoid sea beast spawned from the discarded cells of Frankenstein’s monster, attacks the shores of Tokyo. While the Japanese military prepares to take action, Gaira’s Gargantua brother, Sanda, descends from the mountains to defend his kin. A battle between good and evil ensues, leaving brothers divided and a city in ruins.