The sequel to the popular game is here! Your mission is to fight your way and destroy the Plutonium Boss before he destroys you. Along the way to your final encounter are many warlords of the underground you must destroy.

Jason has redesigned his mobile assault vehicle, S.O.P.H.I.A., to make it an almost unstoppable machine. Now it`s up to you to help Jason recover the weapons that were stolen from his lab by the evil vermin of the underground. You`ll have to learn the controls of S.O.P.H.I.A. quickly if you`re going to be successful, because these mutants don`t take too kindly to humans. The assault vehicle comes fully equipped for any type of situation: an exit pod for hand-to-hand combat, a 360-degree firing field, high clearance to scale piers and platforms, and booster jets that allow you to hover. So head underground, retrieve those stolen weapons, and show those parasites just how displeased you are by their behavior blast them into oblivion!

Some time has passe since the boy Jason and his tank S.O.P.H.I.A. defeated the evil Plutonium Boss and his radioactive underground mutant henchmen. However, not all is well. It appears that one of Plutonium Boss` underlings has survived. He has destroyed S.O.P.H.I.A. and is now using its parts in order to rise to the surface of the Earth and to conquer it. Jason builds a new S.O.P.H.I.A. tank and is prepared to defend his planet!