An American spaceship crashlands off the coast of Sicily. The rescue party discovers that the astronauts have inadvertently brought back a curious gelatinous mass from the planet Venus. This lump of goo rapidly evolves into be a living reptilian creature, which scientists label an "Ymir". While being subjected to laboratory experimentation, the Ymir begins growing by leaps and bounds, and before long the gigantic monstrosity has escaped and is wreaking havoc in Rome. After battling a zoo elephant and taking a swim in the Tiber, the gargantuan creature holes up in the Colosseum, where the film's pyrotechnic finale occurs.
10 years earlier 10 years later action Adaptation adventure Animation Based on Animated Series based on book based on comic based on comic book based on tv series Based on video game batman biopic Book comedy comic adaptation comic book crime DC DC Comics Disney drama family fantasy History horror Idea-for-TV kids Live Action martial arts Marvel Marvel Comics Musical mystery remake romance sci-fi science fiction scifi Sequel Superhero supervillain suspense teens thriller videogame adaptation war western