The Invincible Space Streaker (1977)

Dr. Wu, an evil scientist, plans on creating monsters by luring gullible children who want to become supermen. Two brothers, one named Shao Po that is half transformed, escape and go to Dr. Pau to finish his transformation into a superman. Now, Shao Po, the rest of the children, and a biker brigade must battle Dr. Wu and his army to save their town from destruction.