Despite its name, the Mutant Jellyfish has a brown caterpillar-like body with a light tan underside and spikes running down its back with four larger spikes at the end of its body. Its head has a giant horn on its forehead and its mouth has yellow flesh, seven teeth, four small teeth and a large tooth inside the mouth, two teeth outside the mouth, a tongue, and two fangs. Its thorax has a pair of yellow wings and four arms with pincer claws on each arm with spikes on the elbows. Its abdomen has four legs with one claw on each leg.
The Mutant Jellyfish fought with Godzilla shortly before he and H.E.A.T. disappeared into the future. The Mutant Jellyfish awaited their return, and was quickly defeated when they arrived back in the present.
The Mutant Jellyfish is able to spew globs of jelly from its mouth that are as toxic as nuclear waste.
The Mutant Jellyfish is an adept swimmer.
Due to its mutation, the Mutant Jellyfish can now fly.
Due to not having many abilities and being much smaller than Godzilla, once Godzilla got the creature in his mouth, he was able to throw it around and kill it.
- Main article: Mutant Jellyfish/Gallery.
- The Mutant Jellyfish reuses Giant Mutant Bee roars.
- Despite its name, the Mutant Jellyfish bears no resemblance to a jellyfish.
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