They are 6ft wide and weigh 450lb (200kg), with countless poisonous tentacles, they have drifted across the void to terrorise the people of Japan. Vast armadas of the slimy horrors have cut off the country's food supply. As soon as one is killed more appear to take its place.
Finally, the quarrelsome governments of the region are banding together to unite against the enemy.
I'm just waiting for the shots of masses of people running across bridges while sirens sound in the background.