Earth

Sonic was running through different parts of earth until he came across capsule corps, then went to run in there before Goten and Trunks appeared in front of him.

''HEY!'' Goten and Trunks both greeted, causing Sonic to smile.

''What's up?'' Sonic asked and Goten and Trunks looked at each other while grinning.

''We wanna go on an adventure with you, that's what!'' Goten and Trunks both said and Sonic rubbed his chin.

''Well, I need to be able to cooperate with as many people here as I can, so why not?'' Sonic replied while shrugging.

Later

Sonic, Goten and Trunks ended up at a beach after 30 minutes of travelling and saw an island in the background.

''Alright, let's go-'' Sonic went to run, but saw the water, ''-ooh no!''

''What's wrong? Can't you fly?'' Goten asked and Sonic sputtered.

''Can I fl-'' Sonic started, ''Of course I can't fly! Plus, this is water! I hate water!''

''So you have aquaphobia, then?'' Trunks asked and Sonic nodded, ''Okay then.''

Trunks grabbed Sonic by the leg and flew across the water as Sonic looked sick and Goten was flying with him.

''I think i'm gonna be sick.'' Sonic said before putting his hands on his mouth and his cheeks puffed out.

''Oh, get over it.'' Trunks scoffed before they eventually reached the island, ''We're here.''

Trunks then threw Sonic on the ground, who had stars around his head and a sick looking face.

''Well, that's good.'' Sonic said before shaking his head and springing to his feet, ''What's this place?''

But Sonic didn't get an answer as Goten and Trunks flew deeper into the island.

''Why do I bother?'' Sonic sighed before running after them.

As Sonic kept up with the two half-saiyans easily, Trunks looked at Sonic in surprise and curiosity before looking ahead, only to see a door flying open in front of him and Goten, who couldn't process it in time and ended up being crushed against the walls of a temple by it.

When the door opened, Sonic saw a robed figure come out of the temple as Goten and Trunks were stuck in the wall, swirls replacing eyes.

''Sonic The Hedgehog..my scouts have seen you in action and I must say, I am impressed...slightly.'' the figure said, voice distorted and deep.

''Ah, a villain of the sci-fi genre!'' Sonic said, causing the figure to have a sweat drop come down his head.

''I..what?'' The figure asked with a raised eyebrow.

''You got a robe, a temple and a distorted and deep voice to boot!'' Sonic pointed out, ''You are literally a sci-fi villain!''

The figure was about to respond, but quickly composed himself and cleared his throat.

''Follow me, Hedgehog..only then will you find out who I am.'' The figure said before walking back in the temple.

''Or I can just remove your hood right now and reveal your identity so the audience reading wouldn't have to sit through boring chapters of build up.'' Sonic said, breaking the fourth wall.

''What is this, a book? A movie?'' The figure growled, ''Whatever, just follow me.''

As they walked through the temple, Sonic noticed goth and satanic paintings on the wall.

''Yo..is this some kind of demonic ritual?'' Sonic asked, slightly panicked.

''Of course not, Sonic.'' The figure assured him, '' We here at the league of darkness do not necessarily support satanic behavior.''

''So this is just for decoration?'' Sonic asked and the figure nodded as they kept walking, ''Weird having these as decoration, but i'm not gonna be a guy to judge.''

As the figure and Sonic went down to a dark room with no lights, the figure smirked behind him before raising his finger.

''So, why is this room so dark?'' Sonic asked, oblivious to the finger being raised before he heard a small ball of energy being charged behind him, followed by a red light bouncing off of the walls of the temple, ''Uh oh!''

Sonic barely dodged a line of energy beIng fired by the figure before doing a flip kick, kicking it in the jaw and causing it to stagger back and remove it's hood.

''Okay, no games! Who are you and what do you want with me?'' Sonic asked the figure, who appeared to be arcosian.

''I am Kuriza, Sonic...son of Frieza.'' Kuriza replied, growling, ''And my father was killed by Goku, who I saw you helping in a fight before you suddenly vanished.''

''So you're an angry son who just to happens to be the offspring of a galactic emperor?'' Sonic asked before laughing, ''That's hilarious!''

''Stop mocking me!'' Kuriza said before throwing a punch at Sonic, who quickly blocked it, only for the impact to send Sonic back a few feet, only for Sonic to trade blows with Kuriza, then punch him in the face before Kuriza elbowed Sonic in the stomach, then kicked him into a wall.

''Now it is time to die..'' Kuriza said before charging up a blast, causing Sonic to run at blinding speeds to Kuriza and kick his hands, sending the blast upwards and having the temple start to collapse.

Sonic and Kuriza rushed outside as Goten and Trunks were trading blows with two more arcosians, causing shockwaves to be around the island they were at.

''Goten!'' Sonic shouted, causing Goten to shoot a ki blast down and propel Sonic forward, allowing him to kick Kuriza in the face before bouncing off of his head, ''Trunks!''

Trunks then kicked Sonic, who was in a spin dash, down to Kuriza, only for Kuriza to block the spin dash and power up, sending Sonic into Trunks, who then threw Sonic's spin dash to the arcosian he was fighting, causing the arcosian to be hit as Trunks and Kuriza collided punches, only for Kuriza to then punch Trunks repeatedly and kick him to the ground before blocking a kick from Goten.

''You're a match for me when i'm held back, but nothing more!'' Kuriza said before throwing Goten down and charge up a large blast and fire it at the two half-saiyans, causing a large explosion to occur and Sonic to spin dash into Kuriza with the full power of his light speed dash, only for Kuriza to elbow Sonic to the ground at speeds enough for Sonic to be caught off guard.

When the smoke from the explosion cleared, the two half-saiyans were in the crater, clothes tattered and burnt.

Trunks looked to Goten and coughed.

''Hey, Goten.'' Trunks wheezed as Kuriza landed before them, ''You wanna show him what we're really made of?''

''Sure!'' Goten said before coughing, then both kids teleported out of the crater and powered up to Super Saiyan.

''So this is the form dad was all afraid of?'' Kuriza asked before cackling, ''It doesn't even look impressive!''

Goten and Trunks then began doing the fusion dance, only for Kuriza to fly to them and grab them both by the leg, slam them both against each other, then use them to hit Sonic repeatedly before blasting all three of them and putting his hood back over his head.

''Fools..'' Kuriza said before hiding his power level and flying off as Sonic slowly got up.

''Okay..this might not be good.'' Sonic groaned as Goku and Vegeta landed next to them.

''Goten! Trunks! Sonic!'' Goku yelled as he went to them and Vegeta walked behind.

Sonic looked at Goku and sighed.

''Some guy named Kuriza lured me into his temple to try to kill me, but I saw through it and fought him, but man, was he strong!'' Sonic said, cracking his back and popping his neck, ''Goten and Trunks being like that are the result of this.''

Goku went to Goten and Trunks, then looked at Vegeta, who had the look of surprise on his face.

''Kuriza...I swear, i've heard that name before…'' Vegeta said putting his hand on his chin, ''But I don't quite remember.''

''Guess we'll find out when we find him, huh?'' Goku asked before laughing, ''This is gonna be exciting!''

Vegeta responded with a simple 'hmph' before grabbing Trunks the same time Goku grabbed Goten, then the two saiyans flew off with Sonic following them as fast as he could.

Mobius

''You're sure you want me to come over there?''

''Oh, i'm sure, Twilight. Sonic is in another dimension again and since i'm not with him, I can't find a good way to get him back unless we reprogram the portal to be able to go to any dimension..but such a thing would take months by oneself.''

''And a few days together.''

''Right.''

''Okay, i'm on, Tails.''

''Thanks, Twilight!''

BUM BUM BUUUUUM! 4th chapter done! Sorry I couldn't get this done faster, i've had other things distracting me.

For one, I said in an update that i've gotten into voice acting and i'm not lying. I've already auditioned for Vegeta, Piccolo, Batman, Robotnik and Sentinel Prime, so if I get all of those roles, it will severely diminish the amount of time I get to work on fanfics.

Anywho, hope you guys have fun!