destroy all monsters (1968)

AKA Kaijû sôshingeki.
"I didn't think Tokyo would escape this terror, but Rodan, Godzilla and Manda are all here at the same time."
The year is 1999, and the United Nations has established a base on the moon and quarantined all the monsters on Ogasawara Island, otherwise known as Monsterland. There the authorities are studying Godzilla, Rodan, and the rest of the creatures. Unfortunately an alien race, the Kilaaks, take over the island and control the monsters and scientists based there. They then try to use them in an attempt to conquer the world. It falls to astronaut Katsuo Yemabe (Akira Kubo) and his crew to stop the Kilaaks and get the monsters back onto the island.
Like the WWE of monster movies, they are all here, wreaking havoc all over the planet. Unplug your brain, and enjoying the smashing. There goes Tokyo again...