In a last ditch effort to bring down the robots, the government looks to lone mercenary, Johnny Hurricane, to infiltrate the mothership and search for a weakness. Johnny takes up the challenge, and soon after finds himself sitting outside the ship on a small vent. He takes one last breath before repelling down the shaft...

Once inside, Johnny finds the Gravity Manipulator which grants him the power to briefly reverse gravity in the area around him. As Johnny reverses gravity, he finds himself and anything nearby falling up toward the ceiling. With this new power, he can run on the ceiling, leap incredible distances, or defy death by stopping a fall in mid-air and flying back up.

Altering gravity doesn't just make it easier for Johnny to get around. As gravity changes, his enemies are affected as well. The tide of the battle changes as he flings he foes around, changing the battle ground or sending them to their doom as they crash down into a bed of spikes.