Prologue

Water…

Earth…

Fire…

Air…

Here in New York all is peaceful.

The Purple dragons are gone, April and Casey is now expecting their first child, the Shredder is dead, and Karai is on our side…

…more or less.

We continue to protect our city from crime and at the same time, Master Splinter continue to train us the best he can.

Though we went far with our training, he told us that we haven't reached our peak in training.

But we went against demons, aliens, monsters, and robots from the future and with some of our counterparts.

What else is there?

Well whatever it is, it won't be a match for us heroes in a half-shell.

The turtles just got back from saving their 1980s' counterpart including their comic counterparts too. Though they love that adventure, for the lack of the better word, all the 4 wanted to do is relax. And personally, you can't really blame them. Mikey was reading his comic books, Leo was practicing his ninja moves, Raph was punching his punching back and Donnie was working on a new invention. As for their master Splinter, he was meditating as usual. Ever since the Utroms, the tournament, the Ninja Tribunal, and world jumping, he too needs to relax. As he was meditating, he had a vision. He was in a temple like room and sat in front of him was a man. He had white hair and a white beard and he was wearing red clothing. Splinter opened his eyes. "Through all the worlds that are connected to me and my sons, you contact mine."

"I must." said the man.

Splinter said, "But they just came back from fighting the Utrom Shredder. Surly you can give them a bit more time."

The man said, "I'll give them 3 days. In that time, prepare them for this mission. Not only will they become better ninjas, they will also save my home before it's destroyed. They will probably face the same hardships as the turtles that traveled with me."

Splinter sighs as he hanged his head. After much thought Splinter said, "Very well. But you must promise me; you'll return my sons to me once this is done. And if there's any more in your world, I beg you don't ask for my sons."

Roku said, "I won't, once the next avatar for-fills his duty, a new avatar and guardian will be born and another group of ninjas will be asked."

Splinter asked, "Guardian?"

That's when Splinter an older woman, almost a twin Roku. She was wearing red clothes as well but unlike Roku's they were more for females then males. "I am Guardian Nolin sister of Avatar Roku. Your sons need to go through this. All the ninja turtles have come and gone before us, it's their turn now. Please let them. We promise no harm to them."

Splinter sigh and thought long and hard. Finally, he said, "Show me the faces of the avatar and guardian." He soon saw the 2 change their appearances into a young boy and a young lady though older then the boy. Then he saw visions of the battles that will soon to come. Though in the end they will be victorious, it will indeed change their lives forever.

That afternoon, Splinter walked out of his room and called out his sons. "Boys, come. We have much to talk about." Boys stopped what they were doing and went to the training room. Once there, they knelt down and faced their master. Splinter said, "As you know I'm proud of all of you for defeating the Shredder for good. But now you 4 have one more challenge to face before, you blossom into real ninja worriers."

Leo was the first to ask. "What is it Splinter?"

Splinter said, "As you know there are other worlds connected to you. You have meet 2 of them. But what you don't know is that all those turtles have faced one final task which involve another world entirely."

Donnie asked, "What do you mean? I mean we went into the spirit world, space, time traveled twice, and went to our originals'."

"What I mean is, there is a world where worriers much like yourselves can bend elements, specifically the 4 basic elements: Water, Earth, Fire, and Air." said Splinter. "The only that that can control all 4 is known as the avatar and the guardian."

Raph raised an eyebrow. "The avatar? Sounds like a hero in Mikey's comic books."

Mickey took offence. "Hey!"

Splinter raised his hand to silence them. "Enough. I'm not making this up. You 4 have been chosen to help the guardian help the avatar to save the world. Just now I have seen visions of that world and the enemies you will face." Then he pulled out the scroll and started to draw something. "While the avatar will have help through his friends, there is one person you must protect." Then when he finished, he held up the picture and it was the girl that he saw. "For you see the guardian has 1 main element depending on where he or she is born. Once the avatar master the 4 elements, the guardian will gain an element signature."

Leo asked, "So if this one was born knowing air bending she already has that signature?"

Splinter said, "That and you'll see tattoos that'll match the signature."

Donnie asked, "If this world exist, how do we enter it?"

Mikey asked, "Or better question: Do we need to bring helmets? Cause I'm tired of falling and landing on my head."

Splinter said, "That I can't answer, but the pervious avatar and guardian is giving you 3 days until you go to that world. Once there, it all depends on when you'll come back." He walked to them. "When you arrive, you'll be given 4 emulates: one for each of you. It will change your appearance so you can blend into that world."

Raph asked, "No sewers?"

Splinter said, "None what so ever."

Leo asked, "What should we do for the next 3 days?"

Splinter said, "Train. Train long and hard for once you're there, a hidden power within you will awaken and I won't be there to help you."

Donnie asked, "How do you know all of this stuff Master Splinter?"

Splinter explained. "When I was in the first tournament in the magical world, I did fight against a fire-bender avatar named Roku. His sister wasn't involved in the tournament at the time. Though he was a young man and just begun to learn about the 4 elements, we grew as friends. He told me about his world and how some people can bend only one element or none at all. Then he told me about his past lives and how they as well meet ninja turtles like you. But they had to return home once he was done with his training."

Mikey was confused. "Wait. If the world is in trouble, then why didn't they stay to help Roku and his sister?"

Splinter said, "I can't answer that. Every visit is different. You might be there for a week, a month, or even a year or so. But the answer might fall onto the new avatar and guardian." Then he stood up. "Now I'm asking all of you, don't bring anything with you other than your weapons. No technology, no comics, no extra weapons, and no attitude." The 4 groaned but mostly Mikey and Donnie. The experience will really be out of their element though it won't be the first.

Then Splinter left the room leaving the turtles to themselves. Raph said, "Alright I'll be the first. I think Splinter lost his mind."

Leo said, "Well I believe him. I mean look at the other places we visited. Some weirder then others."

Donnie said, "I'm sort of with Raph on this one. I mean we went to the tournament and I didn't see any records, or banners or anything about this Roku guy."

Mikey asked, "Are you forgetting the king's son was corrupted at the time? He probably destroyed them when he worked with the dragon that gave Splinter his limp. He probably knew about the other turtles and took it that secret until he was reborn."

Raph said, "Have to admit, Mikey has a point. Actually, now that I think about it, during the tournament I did saw an empty slot. It was quickly filled with us, but I wonder if it was supposed to be for the Avatar."

Donnie said, "If that's true then that explains why we didn't see any benders as Splinter called them."

Leo said, "Well whether it's true or not, I say we should train anyway, just so we won't go soft."

Mikey groans. "So much for relaxation." Then he remembered some people. "Wait! What about April and Casey? How are we going to explain this to them?"

For the first time, well maybe not, they were stumped. Since they have no idea how long they were going to be gone, how will they explain this scenario to their friends? It's not fair. They just got back. They kicked the Shredder's butt. They— "I remember something!" said Raph. His brothers look at him. "The first time we were there, and Leo was hurt, me and 3-horn were trying to get away from the guards when I saw a banner that was half burnt. He had a red robe, hair like in ancient Chinese, and it showed the 4 elements. I think that was Roku." Then he frowned. "But when we were there the second time, it was dust."

Leo said, "Then Splinter isn't lying."

Then Donnie said, "Then we're going to have to train. I mean we learned a lot from the aliens, the Ninja Tribunal, and including our 2 other turtles."

So, that's what they did. They trained more than usual those 3 days, even when they sleep they think of new strategies and techniques. Finally, the 3 days came and went. Splinter told Casey and April what was going to happened and of course at first they didn't believe Splinter but after thinking back on their adventure and the weird places they went to, there were no more complaints. The turtles didn't pack anything since their master told them it wasn't needed.

But the day went by and nothing happened. The turtles grew bored and annoyed. Leo said, "The first time we came prepared is when nothing happens."

Then they started to disappear. Raph said, "I'm starting to hate the element of surprise." Soon enough they disappeared.