What were the Japanese thinking when they came up with this one?
Gamera, freshly escaped from his prison in space, comes back to Earth to go lizardo y lizardo against Barugon. In the final battle Barugon, who can only be killed by water (like any giant rainbow slinging reptile would be) is drowned by Gamera, who lives to fight another day.
It's slow going at first, but there's enough silliness for any fan of Japanese giant monster movies to enjoy. This was released in America as War of the Monsters. Gamera returned in Gamera vs. Gaos.
AKA: War of the Monsters.