Broly was born in the same year, month and day as Sun Wukong. Since he was born with a fighting power of 10,000, King Vegeta, the Saiyan King of Planet Vegeta, regarded Broly as a threat and executed Broly and his father together. However, because Frieza happened to attack Planet Vegeta at that time, the Saiyans who killed the two people did not complete the task in time. When Planet Vegeta was destroyed, Broly's amazing potential burst out and formed a protective shield to protect his father and himself from the planet explosion. However, Broly himself does not know that he is the legendary Super Saiyan who only appears once every thousand years. The legendary berserker only knows destruction and destruction.
Since Broly often lost control as a child, and the consequence of losing control was the destruction of a planet, in order to control and utilize it, Broly's father found someone to make a controller that could inhibit Broly's transformation, so that Broly could grow up. (The legendary Super Saiyan will continue to increase in strength from birth until his body cannot bear it and dies. The last Super Saiyan only lived to be ten years old.)
Broly appeared on Namek in the Namek chapter, until Cell Game, Buu Crisis...
Concept: New Broly