The next arc in the manga is called the ... here’s the synopsis: “Shortly after the ToP and the events of , Goku and Vegeta are training together when Bulma passes along a message from Mister Satan that a mysterious group has appeared at his house and is attempting to kidnap Buu. Goku and Vegeta go to investigate and indeed find a group loading the (still sleeping) Buu into a familiar-looking spaceship,” the summary reads.
As it turns out, the group is able to knock out the Saiyans with a special gun, leaving Goku to wake up at the Galactic Patrol HQ. The organization is the one who kidnapped Buu, and they’ve done so to remove the Grand Kaioshin from the alien. The deity is needed as a criminal has escaped the Galactic Patrol, and the only one capable of stopping the baddie is the Dragon Ball Z Kaioshin.” This seems like it will be exciting!