Escargantua is an antagonist monster that was only mentioned at the end of the movie. Like Insectosaurus, he too was the result of radioactive contamination. The monsters flew for France where Escargantua was crawling to. We never see him onscreen, but it's most likely certain that he was defeated.
Trivia
- His name is a portmanteau of the French word "escargot", meaning "snail", and "Gargantua", a giant from French mythology.