The Giant Slugs' names come from the two English words giant and slug implying the creatures are large slugs.
The Giant Slugs simply look like giant, translucent, slugs.
The Giant Slugs were created after the human race's struggle for survival led them to the Gibberellin, a plant which triples the growth rate of an average food harvest and the Earth's pollution after corporations disobeyed the Japanese government's efforts to take care of the environment at all costs. Instead of complying to the agreement, corporations merely developed a technique to mask the noxious fumes being poured into the sky. So, after the excessive amounts of pollution and the Gibberellin's hormones, the Earth's slugs were mutated into the Giant Slugs. Alas, the Japanese government wasted no time in eradicating the over-sized mollusks, sending flamethrower-equipped soldiers to take care of the creatures. Thanks to the Self Defense Force, every last one of the Giant Slugs were burned alive.
- Main article: Giant Slug/Gallery.