ON A DESERT PLANET, the young bandit Lei and his gang live a life robbing trains when suddenly find themselves caught in the middle of a coup after they kidnap the Royal Princess on board. Defying the gang leader's orders, Lei escapes with the Princess on a quest to restore her father's rightful place on the Throne and save the planet. To do this, they must evade both the armies of the usurper, and his former gang, with nothing more than their brains, brawn, beauty... and a motorcycle that turns into a giant robot with machine guns.