Godzilla vs. King Ghidorah (1991)

Time travelers from the 23rd century return to 1992 to warn Japan that Godzilla will cause a catastrophic nuclear incident in the 21st century and suggest a way to rid the world of him forever. They intend to go back to 1944, to Ragos Island, where a dinosaur was exposed to radiation from the Bikini H-Bomb test and became Godzilla. Upon completion of this task, King Gidor