Final answer:
The movie referenced in the question is The Incredible Mr. Octopus. It features a cuttlefish, which is a type of mollusk and not a gastropod like a snail or a slug.
Step-by-step explanation:
The movie referenced in the question is The Incredible Mr. Octopus. Despite the name, the movie features a fish called a cuttlefish, which is a type of mollusk and not a gastropod. Mollusks are aquatic species and include creatures like snails, slugs, squid, and octopus. The movie's title is a bit misleading because it doesn't feature a gastropod like a snail or a slug.