It is the early summer of 1945, and war reigns in the Pacific Rim with no end in sight. Back in the States, Hollywood B-movie star Syms Thorley lives in a very different world, starring as the Frankenstein-esque Corpuscula, and Kha-Ton-Ra, the living Mummy. But the U.S. Navy has a new role waiting for Thorley, the role of a lifetime.

The top secret Knickerbocker Project is putting the finishing touches on the ultimate biological weapon: a breed of gigantic, fire-breathing, proto-Godzillas engineered to stomp and burn cities on the Japanese mainland. The Navy calls upon Thorley to don a rubber suit and become the merciless Gorgantis, starring in a film that simulates the destruction of a miniature Japanese metropolis. If the demonstration succeeds, the Japanese will surrender and many thousands of lives will be spared; if it fails, the horrible mutant lizards must be unleashed.

One thing is certain: Syms Thorley must now give the most terrifyingly convincing performance of his life.