proper sequel
I know that there has already been a sequel, The Spawning, but in this, you saw a mutated piranha (I think that was what it was), walking around the laboratory as the town drunk (the hero) was snoopining around.
I thought, why not have a sequel which features these. After all, they are not just in the water, they could also be in the trees. (Okay, I don't know if they can climb, but they're aren't just in the water!)
Maybe other mutated forms.
To die is to live, to live is to die