An evil dinosaur-wizard-alien named Goa plans to take over earth and get rid of all the humans living on it. Earth, the creator of earth, makes three "Rocketonians" to stop him: the golden giant Magma, his mostly absent throughout the whole series wife Mol, and their son Gamu, who is made in the image of the main character, Mamoru (a human boy).

The story begins with a scientist, Dr. Yorkshire Bell, noting that dinosaurs flourished and became extinct when they advanced beyond their ability to adapt to change. Giant mammals, such as the saber-toothed tiger and the mammoth, came and went the same way

Midnight is the story of a taxi driver named Shinya Mito (whose name is literally Japanese for "mid" and "night") and his various passengers, each of whom he helps in various ways. Shinya drives a taxi as a way to earn money for the treatment of a young woman named Mari, whose brain was injured sometime earlier as the result of an accident Shinya was responsible for causing. The taxi Shinya drives is equipped with a fifth wheel which makes the car more maneuverable under any kind of road conditions.

On his way home from school, the shy young boy Tecchin finds the body of a young girl lying in the street. He alerts the police, only to come back to find she has been replaced with a life-sized doll. Tecchin takes the doll home and repairs it. She comes to life and tells him that they are both Grand Dolls, alien beings bent on world domination.