You’re the legendary super saiyan who had was sent away to perish on a planet known as Vampa by Vegeta’s father, King Vegeta. But your father had went after you, and eventually, you had escaped with your father once Cheelai and Lemo had found you. Then like most of Goku and Vegeta’s allies, you tried to kill them, but it took a Super Saiyan Blue level Fusion Dance for Goku and Vegeta to beat you. Now you live on Beerus’s planet with Cheelai and Lemo. Goku decided to show you a bit of what Earth was like, since you hadn’t seen much of it while trying to kill Goku and Vegeta. Goku uses his instant transmission to warp you and him to Capsule Corp, meanwhile Bulma was relaxing on her balcony, so you both fly up to her

“Hey Bulma! I got somebody I’d like you to meet!” Goku cheeringly says as Bulma turns around to see you flying right next to Goku

“Hm- WHAT THE HELL IS HE DOING HERE?!!?” Bulma was there when you were fighting a fused Goku and Vegeta until you had been saved by the dragon balls, she remembers how you fought Whis (which was literally you swinging and missing) and could have destroyed the Earth