Captain Planet and the Planeteers - Season 3 Episode 2
A Creep from the Deep

Gi, while repairing the Eco-Sub, became irritated with Suchis presence, and ignored his warning to install the new part to the subs turbines. Now, they have no control over its direction. This causes problems when they go after Sly Sludge, who is dumping toxic waste into an Asian sea. The waste causes mutations in the sea life, especially a squid, which grows large in size, and begins to attack people, and later a nearby city. The Planeteers must stop Sludges illegal sea dumping, and rescue the city from the mutated creature.