Dr. Tatsunoko of the Tatsunoko Research Center dives underwater with his daughter Asari to investigate mysterious radiation, where they discover a giant shell. It is established that the radiation originates from a globe contained within the shell. Asari then finds a compact-shaped object containing a message. The message states that a space alien from the Planet of Parlum, which is on the verge of extinction, is lying inside the globe. Suddenly, a boy with a strange appearance emerges from the globe and goes wild. He is the individual mentioned in the message, named Ace. His source of energy for superhuman power is known as space food, and he can fly using a Silver Ring made from energy collected instantly from the aerial environment. He can also use it as a weapon to fight enemies. Supported by his friends, including Asari, the robot dog Ibo, and Hermit Crab Reporter, he gallantly goes into action to resolve various difficulties caused by mystic robots and brutal space invaders.