Season 1 of J9 Series premiered on October 6, 1981.

In the year 2111, the solar system has been colonized. King Carmen wants to destroy the planet Jupiter in order to create a new star and change the solar system. Team J9 is assembled with Isaac Godonov, Blaster Kid, Stephen Bowie, and Angel Omachi. With the robot Braiger, they are a team that will handle any missions the police will not in the asteroid belt. Meanwhile, Earth has been divided into four power blocs: Omega, Red Dragon, Volga and Nubia. Nubia hatches a plan to rule the solar system in which Jupiter is destroyed, leading to the creation of over 30 smaller planets that could sustain life. However, such a plan would lead to the destruction of Earth.

Season 2 of J9 Series premiered on July 6, 1982.

The story is set 300 years after the destruction of Jupiter where the solar system was in a state of peace under the Bakufu government. However, the lawlessness of this new solar system prompts a man named Dan Condor to organise a new J9 team to fight against injustice. Equipped with Cosmobikes, they merge into a super robot named Baxinger.

Season 3 of J9 Series premiered on April 5, 1983.

The year is 2911 and the solar system consists of 50 planets. I.C Blues, a casino gambler, makes a bet with the boss of a criminal syndicate known as Bloody God that it is possible to navigate to all 50 planets within the space of one year. Taking up the challenge of I.C Blues is the J9-III team, made up of Rocky, Beat and Birdy, who have purchased a super robot capable of transforming into a train from the space merchant, D.D Richman. This robot is Sasuraiger. As Blues and the J9-III team starts the challenge, it soon becomes evident that the Bloody Syndicate will do anything to ensure the J9-III team loses the bet. Sasuraiger will become the J9-III team's best defense as they adventure across the stars.