In the year 2038, a group of scavengers enter the complex of the renegade Kyron-5 in search of precious element Texmexium. Death befalls each one until only the mechanic Brooklyn is left. He meets a stranded Texas Air Ranger and two children living in the rubble. They must destroy Kyron-5 in order to escape and to save humanity from its wrath. Brooklyn discovers a GUNHED (Gun UNit Heavy Elimination Device) combat robot and restores it. Meanwhile, Babe has been transformed into a bio-droid and is seeking out Sergeant Nim and the Texmexium she stole. In order to save her and destroy Kyron-5, Brooklyn must overcome his fear of cockpits and pilot the GUNHED all the way to the top of the tower. On the way, he faces the combined defenses of the complex.