The description pretty much says it all, as it's hard to explain. Abandon traditional fanfic expectations all ye who read on, as it's more based on dialogue than anything else.
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Chapter 1 – The Gathering (I don't know why I chose it, I just didn't have a good name)
On a clear summer's day, Sonic was peacefully laying under a tree on a field, having a monologue running in his head. "The name's Sonic. Sonic the Hedgehog. Some call me "The Blue Blur", "The fastest thing alive", "That short dude with the blue spikes", or the ever popular "Sonikku."
Suddenly, as if right on queue, Tails arrived by the tree in his Tornado II and stopped.
Sonic looked over at Tails and continued his inner monologue. "This is my pal, Miles "Tails" Prower. He's also my sidekick and best friend, and has two tails. People like to know if he has two of anything else, but he never likes to answer that question."
"Sonic! Hurry and get in!" Tails yelled. "I've got a trace on the ship, and I'm making my way there now."
Sonic quickly got up and hopped in the tornado. "Alright, let's get going!"
And with that, Tails started up the engine and they took off. As they made their way towards the ship, Sonic continued his monologue. "So these Metallix robots have been robbing various places for a while now, and by getting aboard this ship, we may gain some more info to help us take them down."
A short time later, they were slowly gaining on the enemy ship which was shaped like Metal Sonic's head. As they approached the ship in the tornado, the ship began firing a barrage of missiles which Tails evaded by flying over them to the right. He blasted the missiles from the right while slowly ascending as he flew by. He flew up to the back of the head (of which it's modelled after) and fired a laser cannon, blowing a hole through the ship which they entered.
They travelled down several corridors, blasting grey humanoid robots to pieces as they changed direction every few moments before coming to a stop near a metal door. As they hopped out of the tornado, Tails examined the door for a few moments. He then reached into his seat and pulled out a rocket launcher, just before blowing up the door.
"So where is Knuckles?" Sonic asked, looking around. "Didn't you say he was on the ship?"
"He's probably further down here somewhere; he said he followed that Metallix member on board the ship."
And so, they continued along the newly opened path in the tornado, so the other robots wouldn't steal it. After blowing up dozens of elite robots of the same variety, they came to a door which had a note on it saying, "Poker game in progress, do not disturb."
Sonic and Tails examined the note in complete silence for a few moments. Sonic then turned to Tails and said, "Let's knock it down."
"Agreed." Tails replied with a nod.
Behind the door, several generic robots were sitting round a table playing poker. The room was lit with neon green lights. One of the robots swapped one of its cards before saying, "Sonic and Tails must be nearby with all that ruckus going on outside."
"Don't worry about them, the elite robots will take care of them." Another robot replied.
"Yeah but times like this is when they bust down the door, and walk in ready to kick ass, you know?"
"Well that won't happen this time. They've probably been taken care of by now."
Just then, a big explosion blew up the door and Sonic and Tails walked in, ready to kick ass.
One robot put down its cards. "I hate it when that happens…"
Sonic looked around the room. "Okay fella's, party's over. Surrender now and your asses won't be kicked as hard as they should be."
One robot stood up. "Sorry, we're not being paid enough to get our asses kicked, but we'll do it anyway." With that, the robot charged at them.
Tails randomly took out a wrench and threw it, hitting the robot and knocking it out. Sonic spin dashed through another, knocking it to the ground. The third one fired several shots at Tails who blocked them with his wrench, then after getting close enough he whacked it in the back of its head, knocking it out.
"This fight scene is pretty lame." Tails randomly said.
Sonic shrugged. "They're random robots, it's not meant to be decent."
Knuckles suddenly came out of nowhere and punched the last robot through a wall then turned to Sonic and Tails. "Hey guys, about time you got here."
Sonic, once again, continued his monologue. "That there is Knuckles the Echidna, the last of his kind…maybe. Former rival, and partly my second sidekick, though he doesn't like to be called that…So Knuckles, what have you been doing while waiting?"
"Punching things and finding keys, what else?"
"Alright, now we can go through that door we'll eventually find which needs three keys to get past."
Sonic, Tails and Knuckles continued on past the room and down more corridors, blowing up more robots then opening a door which required three keys. After the door opened, they walked down a short corridor and into the control room where a Metal Sonic clone was sitting in a metal chair behind a row of consoles above some stairs.
Sonic pointed at the robot. "Give it up, it's over!"
"Blasphemy!" He yelled, slamming his hand on the console. "Never before have I heard such generic words!"
"You'll be hearing even more generic words after we spend around 25 seconds punching you around the room!"
He hit a self destruct button on the console. "Then I will run away instead!" He said, as he obviously ran out a backdoor.
Tails pointed at the door and yelled, "After him! He's running away!" the three of them chased the robot out the door and down the corridor which soon split into four tunnelled paths.
The robot turned its head and yelled, "You'll never find me down tunnel four!"
Tails pointed again and yelled, "After him! He's going down tunnel four!"
"Tails, stop pointing out the obvious." Knuckles responded.
"I can't help it…"
"Let's speed up after going down tunnel four!" Sonic yelled. They ran down the tunnel and it soon split into two paths. "How can there be two paths in tunnel four?!"
Knuckles shrugged. "Who said there had to be one path in tunnel four?"
"I just assumed tunnel four had one path."
"Tunnel four is pretty long." Tails said.
"I'll take the second path in tunnel four." Knuckles said before going down the second path, as he just said.
"Let's continue down tunnel four." Sonic said with a nod.
And so they did, and Sonic and Tails soon spotted the Metal Sonic look-alike run past them. Tails then contacted Knuckles using a walkie-talkie. "Knuckles, we found him in tunnel four."
"Okay, I'm making my way to that tunnel four."
"We'll see you at that tunnel four."
"Something something tunnel four." Knuckles said before ending the conversation.
They soon cornered the robot, and then Knuckles pointed at him and said, "We've trapped you in tunnel four!"
"Blasted, I never thought it could happen in tunnel four, time for plan B." he turned to a wall and fired a missile as he yelled, "Tunnel fo-I mean, standard missile attack!" he said before blowing up a wall next to him, leading outside. He jumped out of the ship and flew off ahead while slowly descending.
"To the tornado!" Tails yelled before running back. Sonic and Knuckles quickly followed. After they got to the tornado and flew off the ship with Sonic sitting on the right wing, the large ship finally blew up 20 seconds later while Tails tried to pinpoint where the robot flew off to. "Guys, I think I may have found out where he is, though he's pretty far from here, it seems."
"So where is he?" Knuckles asked.
"Some forest area."
"And the name?"
"How should I know? Let's just follow it but talk a little bit more because there isn't anything going on at the moment."
"We'll talk more when we get there."
"Fine. But first just one question, just how did you get aboard the ship, Knuckles?"
"Well, I was just minding my own business, looking after the master emerald as usual when suddenly I saw that ship travelling in the distance. Obviously, it was one of those Metallix members, so I followed them to this cargo area where they were loading something onto the ship. They soon spotted me, and I had no choice but to punch out any of the attacking robots in my way and get onto the ship before it took off."
"And what were they stealing?" Sonic asked.
"I have no idea, but we'll soon find out."
A few minutes later, they arrived in a tropical forest with dozens of villagers around and several shops around the area, as well as a large number of huts. Tails parked the tornado by the shore next to several other boats and the three of them hopped onto dry land and walked through the village.
"So which way now, Tails?" Sonic asked.
"Just straight ahead." He pointed further past a gate.
Suddenly, a person in a black ninja outfit with the Sonic Adventure 2 logo on his chest approached them. "Down there are the ruins of Legendary Heroes."
"Legendary Heroes?" Knuckles inquired.
"Yep, heroes from another world, or universe, or even dimension!"
"Isn't a universe bigger than a dimension? Therefore shouldn't it really have been the last example in your sentence?" Tails asked.
"Whatever, good luck." He said before walking off.
"Bye, random ninja guy, and thanks." Sonic waved. "Alright guys, let's make our way there and find that guy."
"You're gonna have to speed through this part, right?" Knuckles asked.
"Looks like it." Sonic said with a shrug.
"As I figured."
"So I'll see you guys there." Sonic said before running on ahead and jumping over the gate, then speeding down the clear trail straight ahead.
Tails looked at Knuckles and said, "Sonic will most likely take the longest route there, so we should take the shortcut and get there a bit before him."
"Right."
Tails and Knuckles jumped over the gate and went to the left instead of straight ahead.