Nebula Mask Machineman was created by Shotaro Ishinomori and produced by Toei Company. It ran for 36 episodes during 1984. It begins with Nick (Osamu Sakuta) and his ball-shaped robot Ball Boy arriving on Earth in their Space Colony ship from the Ivy Planet and hopes to one day graduate with a degree in Sociology. Upon arriving on Earth, his primary objective is studying human behaviour and mannerisms.
Taking the human name Ken Takase, Nick meets Maki Hayama (Kiyomi Tsukada), a photographer at Shukan Hit newspaper. Later he has to save her from a building fall when Maki was taking pictures for a scoop about a building which had been mysteriously demolished. Later, she and Ken find that the evil organisation known as 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 of Machineman, a red- and yellow-suited superhero!
A few episodes later, Machine Man succeeds in dismantling Tentacle; however, Professor K flees to Spain and his niece, Lady M, appears. With her aide Tonchinkan, they establish a new organization called “Octopus”. Like her uncle, she is allergic to children (whenever she is near one, her nose turns red). In the beginning, she calls up various thieves and legendary criminals from around the world, but later robotic drones are assembled to combat Machine Man. By the end of the series, the missing Professor K returns, bringing with him the biggest threat the hero had ever faced: Golden Monsu, a fortified version of Tetsujin Monsu.