In the vast universe, there is a place called "Star Sphere" where humans, robots and aliens live together. One day, the Space Development Company of the Disheartened Planet sent two ace fighters, "General Big Monster" and "Corporal Little Monster", carrying the ultimate weapon with powerful power that gives life and wisdom to machines - five-color magic gems, to forcibly occupy the "Star Sphere". However, when they rushed into the atmosphere, an accident occurred. In addition to the black gems, red, pink, green and blue gems were scattered on the Star Sphere. On the Star Sphere, there is a genius mechanic, Dr. Zhai. When repairing junk electrical appliances, four old motorcycles happened to encounter four gems and activated them inadvertently; from then on, Happy Superman, Sweetheart Superman, Flowery Superman and Careless Superman were born. Under the leadership of Dr. Zhai, they thwarted the invaders' conspiracy again and again and protected the "Star Sphere".