- Weight: 20 tons (estimated)
- Regular Abilities: Very weak acid globs from the mouth
- Special Abilities: Fast swimming
- Does NOT look anything like a jellyfish, looks more like a caterpillar.
The Mutant Jellyfish fought Zilla in the episode "Future Shock". In the episode it is seen tracked down by H.E.A.T. and Zilla. When H.E.A.T. came back from the future Zilla already destroyed it with his jaws.