The time is space calendar 2000. Robots have finally surpassed humans, and the earth has been conquered by the robot Madmobile made by robots! Humans were cornered and escaped into a four-dimensional cave, and the only way to regain the Earth was to obtain the "Tenjiku Power" in the Tenjiku Nebula...! The main character Goku and his friends rampage on a space scale in Space Journey to the West.