Chapter 1: The Merging of Two Worlds

(Subspace)

Long after his defeat against Mario and Sonic, the wicked god, Tabuu was already making plans for a second attack. However, in the shadows in Subspace was a certain hedgehog whom everyone in Sonic's world believed to have been dead for some time, long before Tabuu made Mario and Sonic switch worlds.

Tabuu- First that fool who befriended my twin brother and now his decedent makes a fool of me! Fortunately, I've nearly regained all of my power. However, the curse preventing me from physically leaving makes it harder to get what I need. Which is where you come in, my new friend. I'm also betting you're eager to face Sonic and Shadow again after what they did to you.

Mysterious hedgehog- I am, but I'm mostly agreeing to this because I need what you promised me on your end of the deal.

Tabuu- But of course. First you must hold up your end and find me those two items. One was a certain item you stole while wreaking havoc on Mobius, and the other item is in the Mushroom Kingdom.

Mysterious hedgehog- So you want me to go to both worlds and find each of them?

Tabuu- Why search two worlds when we can make them into one and make your job quicker.

Then Tabuu made a small blue ball of energy appear in his left hand.

Tabuu- This is a sample of Mario's world.

Then Tabuu made a small green ball of energy appear in his right hand.

Tabuu- And this is a sample of the world you and Sonic are from. Now then...let the fun begin.

Then Tabuu began slowly merging those two energy balls

(At a beach somewhere in the Mushroom Kingdom)

Mario, Luigi, Yoshi, and Toad were on the beach, playing a game of volleyball, and enjoying a lovely day. Mario was enjoying himself, until he felt a sudden disturbance for a split second. Suddenly, the volleyball hit Mario in the face and Mario fell over. Luigi, Yoshi, and Toad rushed to Mario.

Yoshi- Did Yoshi hit ball too hard?

Luigi- No. Mario just froze all of a sudden.

Luigi helped Mario get back up.

Luigi- Mario, is something wrong?

Mario- I'm not sure. I felt something. Like something dangerous is about to happen soon. But it also feels familiar. I haven't had a feeling like this since Tabuu attacked.

Luigi- That's not good! Tabuu nearly killed you and that blue hedgehog, Sonic, the last time you fought him!

Suddenly the entire area began to shake like an earthquake. Mario and the others were barely able to keep their balance except for Toad who stumbled over almost instantly.

Luigi- Mario, what's going on?!

Mario- I wish I knew!

(On a beach somewhere on Mobius)

Sonic, Tails, Knuckles, and Amy were enjoying a day at the beach. Knuckles and Amy were already in the water while Sonic was laying on a lawn chair under an umbrella, wearing some sunglasses. Tails ran up to Sonic with a new device he made.

Tails- Sonic, I finally finished it. It's a jet propelled body board. You want to try it out?

Sonic- Not right now, thanks.

Tails- Ok. I'll go use it myself.

Sonic- Tails is just like a little kid with his new toy.

Tails got in the water and the body board splashed water all over Sonic as it dashed off. That irritated Sonic a little bit. However, shortly after he got all the water off of him, Sonic felt something, like a disturbance. Amy and Knuckles walked up to Sonic to see if something was wrong.

Amy- Sonic, are you alright?

Sonic- Not sure. Something doesn't feel right. Not sure what it is, but I think something big is about to happen soon.

Suddenly, the ground began to shake all around. Tails almost lost balance on his new body board and just flew to shore.

Tails- Sonic, what's happening?!

Sonic- I don't know!

(In Subspace)

Tabuu managed to force those two essences of Mario and Sonic's worlds together and they vanished in a bright light after the ground shook for a bit in Subspace. Tabuu turned to face the mysterious hedgehog.

Tabuu- There. That should make your job a lot easier.

Mysterious hedgehog- What did you do?

Tabuu- I just merged the two worlds into one. Now you can get both those items I require to free myself from Subspace in one trip. And if anyone gets in your way, deal with them. However, if you encounter Mario or Sonic, do not finish them off. I want them to witness the destruction of everything they care about. Mostly Mario, because his ****ing ancestor is the reason why I've spent a 1,000 years in this shitty hell hole!

Mysterious hedgehog- You're not the only one with an axe to grind. I haven't forgotten what Sonic and Shadow did to me before you came to my rescue. But I guess you're right, it would be more fun to make them suffer for what happened to us. You have nothing to worry about. With the new powers you've given me, I can slaughter anyone that crosses my path.

Tabuu- Confident, I like that about you. But overconfidence can be your undoing. I had to learn that the hard way…twice!

Mysterious hedgehog- Oh?

Tabuu- You should know, since you thought Sonic and Shadow were no match for you. But then they performed that technique and literally blasted you into space. As for me, I tried fighting Mario and Sonic when I had only recovered half of my strength. However, the first time was when I fought the original Mario Brothers. Apparently, after my twin brother gave those two the power to protect the Mushroom Kingdom from the Koopas, their paths crossed with many other warriors and they formed an alliance, or a team if you would. Individually, I would've crushed all of them like bugs with hardly any effort…but when they all worked together, they managed to beat me and lock me in here.

Mysterious hedgehog- Even if Sonic and Shadow perform that trick again, I'm way more powerful than before. And this Mario character won't make much of a difference either.

Tabuu- Wake up you fool! It's not just Mario and Sonic I'm talking about! Over the past few months, Mario has befriended many others who fight for the same cause. Aside from Sonic, at least seven other heroes. True that alone you can crush any of them, but if they were to all join forces…you could be overpowered like I was against the original Mario Brothers' team. I do not know if any of them will appear during this event, but just in case, use the element of stealth as much as possible. I prefer not to take the chance of you falling before I can break free, and even with the power I gave to you, your power is still nowhere near the level of mine.

Mysterious hedgehog- (thinks) We'll see about that once you've given me what you promised.

Tabuu opened a portal next to the mysterious hedgehog.

Tabuu- Now go and retrieve the two items I need to free myself. You have one week to do so. Oh, and don't worry, I haven't forgotten your reward. You pull this off and I shall return what Sonic and Shadow took away from you.

Mysterious hedgehog- That's good to hear.

Then the Mysterious hedgehog entered the portal to this strange new world.

Tabuu- Someone like him usually hates to follow someone else's orders, even if I am much more powerful than him. It's also hard persuading someone who's more interested in blood than wealth or power to cooperate. But with how badly he needs this, he'll be a perfect puppet. All that's left to do is wait and hopefully, he won't blow this damn job.

(On the beach in the Mushroom Kingdom)

Mario, Luigi, Yoshi, and Toad were laying on the ground after being blinded by a bright flash of light after the earthquake stopped. But as they got up, they noticed that something was off.

Toad- Are we still on the beach, because something seems out of place.

It still looked like the beach they were on before, but it looked like pieces of land from other places were spliced into the landscape.

Luigi- I think so, but what are those things popping into the land all over the place.

Mario- They look familiar. I think I've seen those on…Mobius! Those are pieces of land from where Sonic is from!

Luigi, Yoshi, and Toad looked at Mario.

Luigi- You sure? I've never seen land like this when we met Sonic.

Mario- Because I was the only one who was brought to Mobius. Remember? Tabuu made me and Sonic switch places. This could mean Sonic could be involved somehow. I think it might be best if we inform Princess Peach about this.

(On the beach on Mobius)

Sonic, Tails, Knuckles, and Amy had just woken up after a bright light knocked them out. They got up, Tails looked around, and was freaked out at what he saw in the sky.

Tails- Sonic, that cloud in the sky! Suddenly it just grew eyes!

Knuckles- Not just that; These mushrooms growing in the grass nearby also have eyes.

Amy- Now that they've mentioned it, lots of these areas don't look like they're part of Mobius.

Then Sonic remembered his adventure in the Mushroom Kingdom when he and Mario switched places.

Sonic- I think I've seen this before. Eyes on so many inanimate objects, not to mention part of the area, resembles what I saw in the Mushroom Kingdom, the place where Mario is from.

Tails- So this is what the Mushroom Kingdom looks like. Part of me was curious when Knuckles and I were trying to help him return to his world.

Knuckles- But what the hell does this mean?!

Sonic- I don't know. But I don't think we'll find answers standing here.