MACRA
Overview
General Appearance: crab-like creature
Home Planet: New Earth
Abilities: Survive and feed on exhaust fumes; large pinchers
Weaknesses: low intelligence
General Description and Background
Macra were once an intelligent race capable of enslaving humans in order to make them mine the noxious fumes on which they live. They have since devolved into mindless creatures living in and on exhaust fumes found in the Under-City of New New York on the planet of New Earth over five billion years in our future.
Abilities and Dangers
While once possessing extreme intelligence and hypnotic powers, in the far future the Macra are only truly notable for their ability to survive (and in fact thrive) in the noxious fumes produced by hover-cars and for their size.
They are only dangerous if one gets too close to them. Their large pinchers can crush a hover-car easily. So just stay away and it can't do anything to you. Yes, that could work, if you don't end up in the fast lane of the Under-City highway.
Weaknesses
The Macra in the far future are incapable of perceiving an object that is not in motion and making noise. Wait a minute. All you have to do to not let one of these stupid crab thing see you is hold still. That is the lamest thing ever. I don't think these crabs can be considered dangerous if all you have to do is stop moving. Therefore a hover-car trapped among a large number of them can shut down to avoid detection. However, this solution is temporary at best as the hover-car's life support will be shut down too.
Author's Note: Still avoiding Calculus...