When they return back to earth looking for fighters

Sonic: I can't believe your universe is gonna get destroyed if you lose in the tournament of power…

Goku: Yeah, I didn't know our universes would be destroyed, I just thought of it as a friendly competition.

Sonic: (Friendly competition, in a battle royale? Yeah, he doesn't really have any brains does he?)

Goku: But before we start looking for fighters, we should have us a little sparring match, whaddya say!

Sonic: Sure, I was thinking about asking you anyway!

Goku: Awesome, I know exactly where to go!

Sonic: -smiles- Then take us there!

-After using instant transmission to go to Kami's lookout, the meet Popo and Dende, then enter the Hyperbolic Time Chamber-

Sonic: Its feels pretty weird in this place…

Goku: You'll get used to it, so anyway.. you wanna fight?

Sonic: Bout time you asked! -dashes towards him a punches him far back-

-Goku fires several ki blasts at Sonic but he dodges all of them, Goku teleports behind him and kicks him in the air, them slams him back-

Sonic: Gah.. Your pretty awesome Goku!

Goku: Right back at ya, but its time to go to the next level.. Hyaa! -Goes Super Saiyan- Now try to keep up with me..

Sonic: Heh… (Good thing I learned to transform without the emeralds)

-Sonic closes his eyes with a golden aura surrounding him, he starts to float in the air, then goes Super Sonic-

Goku: Amazing.. (So he WAS holding back against Basil, he is a real incredible guy)

Vegeta: WHAT IN THE WORLD?!

Goku: HUH, VEGETA?!

Sonic: Haha, hey bud -laughs nervously-

Vegeta: I can't believe it… -faints-

-Goku and Sonic look at each other and start laughing-

Goku: Well, I guess its time to start looking for fighters…

Sonic: Lets go then…

They gathered the Z Fighters and explained who Sonic was

Piccolo: I see… But can he really handle himself out there?

Sonic: You should be saying that to shorty over there…

Krillin: Hey!

Android 18: Don't you talk about my husband!

Sonic: Okay okay, jesus man.. (Is everyone in this world so sensitive…)

Tien: Wait a minute… Goku didn't you say we needed ten fighters?
Goku: Yep!

Krillin: T-then where's Buu?!

Goku: -looks around then laughs nervously-

Piccolo: How are we gonna survive if we don't have all 10 fighters?!

?: I believe I can help with that..

Sonic: -turns around then sees a certain someone and the smiles…- Well look who it is!