Travelling in the spaceship "Space Colony", Nick, with the help of his ball-shaped robot "Ball Boy", arrive on Earth to study the behaviour and manners of human beings for his doctoral degree thesis. Under the human identity of a young man named Ken Takase, he meets Maki Hayama, a photographer at Shukan Hit newspaper, and later saves her from a building fall. Maki was taking pictures for a scoop about a building which had been mysteriously demolished. Later, she and Ken find that the evil organization "Tentacle" is behind the demolitions and other evil deeds around the world. Nick then decides to extend his stay on Earth and uses his advanced technology and superior powers to protect his Maki and the children of Earth under the alter-ego Machineman. Armed with an advanced technology weapons, he begins fighting Tentacle's cyborgs and protect humankind.