Mutant Earthworm was the 4th opponent chicken Jack fought in the Creature Combat Club. It was a large worm that had antenna eyes and a round shaped mouth. Its blood was extremely toxic and could melt almost any material. It was brought out in a silver dome container.
Burrow: Mutant Earthworm travels underground.
Surface: Mutant Earthworm surfaces from underground and tries to smash the opponent.
- It's an obvious parody of (or can possibly be) the Mongolian Death Worm, an alleged creature dwelling in Mongolia which has the same properties, but the body of a Mongolian Death Worm will kill by electrocution.