Several aspects of the character are still unknown.
"Prisoner of Galactic Patrol" is the name of the new saga of "Dragon Ball Super", where Goku will have to face a powerful enemy.
As the Japanese V-Jump magazine said, this started when a dangerous issue escaped from the Galactic Prison, so Goku and his friends were fighting to catch.
"In December 2018, a new enemy will appear to face Son Goku. In N-V this 21st of November it will appear a mysterious enemy, the Galactic Prisoner," says the magazine.