What the "spider-pit" sequence from the original King Kong (1933) probably looked like (the original sequence was cut out of the original movie because it was deemed "too gruesome" and was subsequently lost).
A yeti terrorizes people on top of Mount Fuji.
Heavily alerted American version of Japan's Varan. A prehistoric behemoth is unwittingly awoken from hibernation due to a U.S-Japanese military experiment for economic means on it's watery lair.
A girl finds a strange egg and brings it back to her village, only to later realize it was from a monster. Now a giant monster emerges from the lake to search for the egg, destroying the town and its inhabitants.
Aliens from another world seeking the conquest of Earth invade with flying saucers. They unleash a gigantic monster called Wang Ma Gwi, who destroys everything in its path with a powerful death ray.
Shipwrecked survivors slowly transform into mushrooms.