Gil was transformed into a green fish-type mutant he now called himself Gill ("I added an 'L', you know, as in Gill, as in these things that grew when I mutated!"). Gill blamed Ron for his mutation, and desires to get his revenge.

Gill's mutant form powers included superstrength, adept swimming, breathing under water, and spitting the toxic sludge that mutated him, fast drying sludge to hold his victims, or acid.

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