A/N: I do not own Robotboy, Sonic the Hedgehog or Yumi and Yumibot. I do own Mimi and Lisa the Mongoose.

ROBOTHEDGEHOG II: PRINCESS STAR

Prologue

One year ago, there was a boy, who was entrusted with an important task: not only to protect the worlds most powerful prototype fighting robot from an evil genius and his overweight henchman, but to also help him learn to be a real boy. The boy and his robot have been best friends ever since and they met challenges and new allies and foes during their adventures. It was very difficult, since the robot had to be kept in secret. One day, they met the biggest adventure of their lives, after the robot took possession of a mysterious stone, that made the little robot to teleport himself, the boy and all their friends into a world of fantasy and science-fiction all combined. There they met new friends like a blue hedgehog with supersonic speed, an orange two-tailed fox with pilot skills, a red echidna, protector of a huge emerald with supernatural powers, a black hedgehog with the power to control time and space known as the Ultimate Life-form, a pink girl hedgehog with a passion for the blue hedgehog, a rabbit with a creature that follows her wherever she goes to, a white haired bat who will do anything for jewels and many others. Together, they all had to collect seven of the mystical gemstones, like the one the robot used to teleport them there, as an attempt to go back home. Along the way, they met many challenges and foes, like they never faced before, including some old foes from the robot's world, who were revived by an evil clone robot of another evil being from another dimension. In the end, the robot and his friends defeated this evil menace and used the power of the gemstones in order to return home and say good bye to their new friends. One has passed and our heroes have been living peacefully after all of this. But not for long, because a new adventure awaits both of these heroic groups…

"Tommy, it's time for bed!"

"Yeah mom, I hear ya." The sleepy blonde kid known as Tommy Turnbull answer his mother as he entered the bathroom. There, he washed his face and brushed his teeth, all to get ready for bed.

Soon after, Tommy entered his room, where he found his robot friend Robotboy sitting on his bed.

"Ready for bed Tommy?" the cute little robot asked.

"Yeah, I have school in the morning and I can't be late for it." Tommy explained as he tucked himself in his bed and the little robot flew onto the shelf above it, where Tommy pushed a button on his watch to deactivate him.

"Good night Robotboy." Tommy said before going to sleep.

As they slept, they had no idea that he and his robot where being watched through a crystal ball, by someone. This somebody wasn't only watching them; he was also watching their friends: Lola, Gus, Yumi, Yumibot, Robotgirl and Booker, who were all sleeping for the night as well, in their cosy beds.

On Mobius…

Tails was working hard on his workshop, building something. They looked like some kind of boards, even thought they were not done yet. Sonic walks in and watches him working hard on them.

"Working hard Tails?" the blue hedgehog asked his little 'brother'.

"Yeah, I thought it would be cool to build these for them. After all, you did say we might meet them again some day, right?" Tails asked as he carried on working on them.

"Yeah, I can't wait to see how they will feel about them, but I preaty much think they are gonna love them." Sonic said.

"You really think so?" Tails asked.

"Hedgehog's honor." Sonic said before looking at the clock on the wall. "Um, I think you should take a break for now Tails, a working hard mechanist needs to make some 'Z's too!"

"Yeah, okay Sonic." Tails said as put his tools and goggles away and placed a blanket over the boards.

The two of them walk out from the workshop. Tails went to his house and is now sleeping in his cosy bed, while Sonic was on the roof, sleeping under the stars in a laid back way. Unbeknownst to them, they were being watched by same person who is also watching Tommy and the gang, through the crystal ball, as well as the rest of their friends, who were also resting for the night: Knuckles, Amy, Cream, Cheese, G-merl, Vanilla, Shadow, Rouge, Omega, the Commander and Mimi.

The next day, on Earth…

"YIKES!" Tommy jumped as he woke up from his slumber, thanks to his alarm clock.

"Well, that's a good way to start a day." Tommy groaned as he let out a loud yawn before he went to the bathroom to take a shower.

After he was done with the shower, he dried himself up and put on his clothes.

Now 11-years-old, Tommy had grown at least a few inches taller, but his outfit remained the same: the white T-shirt with two strips, one red and the other yellow around the body, his green dungues and his white sneakers. He was still the kind hearted, responsible and determined unofficial leader of the gang. He packed all his school stuff and Robotboy in his silver backpack and went downstairs to eat his breakfast.

Speaking of Robotboy, he was still the cute little cutting edge fighting robot, which has to be kept as a secret from the world, in order to maintain him safe from harm. He still wishes to become a real boy and all, and he has also learned a lot more stuff about being human over the last year and has also battled Kamikazi and other enemies that tried to posses him as well. Of course, he had also met a new enemy: Klaus Von Afonzugel, a weak bodied man, accompanied by his nanny gorilla Ludwig. He wants to posses parts from Robotboy, in order to make himself stronger.

"Good Morning Tom!" Deb greeted his younger son, as he walked in.

"Good morning sport!" Dwight greeted as well.

"'Morning Mom, 'morning dad." Tommy greeted his parents as he sat at the table, preparing his breakfast: a bowl of cereal, orange juice and some fruit.

"'Morning whiner!" Donnie insulted as he came in to eat his own breakfast.

"Yeah, 'morning to you too Donnie." Tommy groaned sarcastically in his mind as he carried on eating his breakfast.

Of course, Donnie, who is now 14-years-old, hasn't change mush at all. He was still the muscle bound, mini sized brain bully in the family. He's muscles have grown more after all his exercise over the last year, he had grown at least two inches taller, his IQ had increased a bit, but was still very low, compared to Tommy.

"All right boys, time to go to school!" Dwight said to his children.

"Yes dad!" Tommy and Donnie said as they rushed out from the door, fighting each other over whom to go out first, but in the end, it was both of them who got out at the same time, rolling on each other and they both fells down the steps.

"OUCH!" They both cried as they both fell on the solid sidewalk.

They both get up quickly.

"I got out first!" Donnie said quickly.

"Pfft, yeah right." Tommy said.

"Boys knock it off!" Dwight demanded as he walked out from the door. "There will be plenty of opportunity for violence after school!"

After all that, Tommy went his own way to school. As he walked down the streets, he had something going in his head: a familiar voice that said "We might meet again someday". Tommy sighted and since no one was watching, he activated Robotboy, who poked his head out from his backpack.

"Tommy?" Robotboy asked his human friend.

"Ro, do you have the feeling that you miss someone?" Tommy asked concerned.

"Robotboy became silent in thought, when he spoke up in sadness, "Yes Tommy…Robotboy, miss Sonic and Tails."

"Yeah, me too buddy." Tommy said with a sigh. "I really wonder if we are actually going to meet them again someday. I mean, the reason we ended up on their planet was because that stupid robot guy had sent that Chaos Emerald into our world, so that Protoboy and Robotman could have their revenge on you."

"Yeah." Robotboy said sadly as Tommy continued walking to school, with him in his backpack.

When Tommy arrived at school, he deactivated Robotboy, so that no one could see him. He walked through the hallways until he stopped by his locker. He opens it up to pick up a number 2 pencil and a rubber.

"Hi Tommy!" Tommy locked over his shoulder and sees Lola, cheerful as usual.

Now 11-years-old, Lola had grown a few inches like Tommy did, her outfit hasn't changed much, except that now she is wearing white-pearl earrings and a pink bracelet on her right wrist, but her light blue dress, white belt and boots were still there. She was still the lovely but energetic girl in the group and she still had a crush for Tommy, but the blonde hero is still yet to find out about it.

"Oh hey Lola,how are you?" Tommy greeted her.

"Same as any other bright new day, and you?" she asked.

"I'm fine." Tommy said as he closed his locker.

Lola noticed that he sounded a little, down headed. "What's wrong Tommy? Is something bothering you?" she asked concerned.

"It's nothing, I was just thinking about our friends from Mobius." Tommy explained.

"You miss them don't you?" Lola asked. "Because I miss them too."

"Yeah, so does Robotboy." Tommy added.

Suddenly they hear a farting sound. The two of them locked at where it came from and they see Gus, eating a sandwich. They had guessed he was the one who farted.

"Oh yeah, that sure was a big one!" the red-headed fat kid said, talking about his fart, while gobbling up his last bite.

Although Gus is now 11-years-old, he was still the fat, candy and junk-food loving idiot of the gang. His outfit was still the same, like Tommy and Lola's; the light blue shirt with a "G" on it, the cobalt blue pants and white sneakers. He did increase a bit his IQ, but like Donnie, it was still low compared to his friends.

"Hey Gus." Tommy and Lola greeted him, plugging their noses because of the fart's stench.

"Hey Tommy-boy! Hey Lola! So I hear you guys talking about the gang from Mobius huh?" Gus asked.

"Actually yes Gus. That sure was an adventure to remember and those guys were way past cool." Tommy said.

"Yeah, I'm sure that someone like Cream must miss me very much. I miss her too." Lola said.

"Dude, I'm pretty sure that their fine without us, like I am still fine without them." Gus said, but then noticed the two of them giving him dark looks on their faces. "Oh, sorry."

"Hey guys!"

"Hello my fellow companions!"

The three of them turned to see Yumi and Booker walking up to them.

Yumi, who is now 11-years-old, was still the tomboy of the gang, her outfit didn't change much, except that she now wears a black tank top with a skull on it. Her blue jeans and black sneakers were still there. Of course she also brought her purple shaded backpack with the deactivated Yumibot in it.

Booker, also 11-years-old, was still the smart and calculative kid of the gang. His outfit remained the peach green T-shirt, green tie, brown shorts and shoes.

The two of them have also grown a few inches taller over the last year like all the others.

"Hey Yumi! Hey Booker!" Tommy, Lola and Gus greeted.

"So I heard you guys talking about the guys from Mobius?" Yumi asked. "I understand, I also feel the same about Shadow and the rest of the guys from G.U.N.."

"I feel the same about them too." Booker said.

"We all miss them, unlike Gus." Lola said as she gave Gus another dark look.

"Hey! I said I was sorry!" Gus defended himself.

"I remember Sonic saying that we might get to meet each other someday, but I have no idea if that is actually gonna happen." Tommy sighted.

"I know, we ended up there because of Eggrobo Nega." Yumi said.

"Yeah." Tommy said.

"Aw sheer up, if Sonic says we'll meet each other someday, then we will meet then again someday!" Booker said. "I was able to calculate his personality and I came to the conclusion that it is a possibility!"

"Nerd." Gus taunted, only to receive a slap in the face by Lola. "OW! What?"

"Damn it Gus, don't you have any respect?" Yumi asked.

RIIIING!!

"Uh oh, we better get to class!" Tommy said as he and the gang rushed for their classroom, without know that someone was still watching them thru a crystal ball.

Back on Mobius…

"YAHOO!!"

Sonic and the gang were all having a party at Boom Beach Town's beach. Sonic was lying on his beach chair under the sun, taking a nap while wearing sunglasses, Amy was sitting next to him, Tails was in the water, surfing on his Jet-propelled body board, Cream, Cheese and Mimi were building a sand castle and G-merl was digging for clams.

Sonic was now 16-years-old, and he had grown a few inches over the last year and he was now wearing a light green ring on his right wrist. He was still the cool, friendly honourable, cocky and dare devil super sonic hedgehog of the gang.

Tails, now 9-years old, had also grown a few inches taller over the last year just like Sonic and he now wore a purple badge with three purple feathers coming out from under it, hanging from a white cord around his neck. He was still the kind hearted and friendly mechanist of the gang.

Amy, now 13-years-old, has also grown a few inches taller and right now, she was wearing a red bikini with small white hearts all over it and pink sandals with green and purple strips and heart pendants on it's sides. She was still the cheerful and energetic number one fan girl of Sonic.

Cream, now 7-years old, grew some inches taller and currently is wearing a yellow swim suit with pink straps and a purple skirt; and pink sandals with yellow straps and flower pendants on their sides. She still had Cheese going around wherever she goes and was still the sweetest girls in the gang.

Mimi, now 6-years-old, has grown a few inches taller and she is now wearing a light blue swim suit with pink strips and light blue sandals with pink straps and heart pendants on it's sides. She was also still one of the sweetest girls in the gang, the other being Cream.

"Thank you so mush for inviting us Mimi, this party is great!" Cream said.

"Chao chao!" Cheese said.

"No problem Cream." Mimi smiled. "I was glad to invite everyone to my beach party. It's shame that some could come."

Of course, Mimi was the one who had this idea of a party at the beach and she had invited the gang to come. Of course, not all of them were there, like Knuckles because he had to take care of the Master Emerald on Angel Island; Shadow, Rouge and Omega weren't there either, because a G.U.N. agent must work hard, day and night. Plus, they don't have much interest in parties. Silver and Blaze had gone back to their own world after saying good bye to their friends from Earth.

"Eh, you know how those guys are, all work and no time for fun." Tails said as he jumped off his body board and onto land.

"You know what could have made this party even more fun?" Amy asked and everyone turned to her, even Sonic who woke up and took his sunglasses off. "That our friends from Earth were here too."

"Oh yeah." Tails said looking away with a sad look. "Those guys were really cool."

"I miss Lola." Cream said.

"Chao." Cheese said.

"Yeah, we all miss them." Sonic said getting up. "But cheer up, I'm pretty sure we'll get to see them again someday. Believe me, you'll never know!" the blue hedgehog added with a wink and a thumbs up.

"Your right Sonic!" Tails exclaimed. "It's like that time we had to say good bye to Blaze that other time when you and her defeated Eggman and Eggman Nega and then we met her again that time we ended up on her world when we were following that energy signature."

"Of course." Sonic said.

"Hey guys, I brought some refreshments!" a female voice called out.

Everyone looks at where it came from and they saw a 12-year old girl mongoose. She had narrow blue eyes, just like Mimi's, she had light pink fur, red hair tighten up to a blue band, forming a pony tail. She was wearing a green bikini with blue flowers on it and brown sandals with red straps. She was carrying a table with refreshments and placed them on a table next to Sonic's chair.

"Thanks sis!" Mimi said.

"I hear you guys were talking about those same friends of yours from another planet?" the older mongoose asked.

"Yeah." Mimi said taking acup and takes a drink from it, then she turned to 'us' and says: "Hey readers, this is here is my sister Lisa the Mongoose. She is an expert in martial arts and she's training me so that I can become an expert like her." she giggled as she finishes explaining.

"Man, I wish they were here." Tails said taking a drink.

"Too bad, I wanted to meet them too." Lisa said.

"I'm sure you would like them, they are way cool!" Mimi said.

"Yeah, except for Gus, that guy was a jerk!" Amy said.

"Maybe, but at least the others can give him a lesson if he does something not cool." Sonic said.

As they carry on chatting and enjoying their drinks, somebody was still watching them through the crystal ball. We zoom out to see a mysterious dark figure with red glowing eyes. He switches the image of the ball to Tommy and the gang, who were having chemistry class, then back to Sonic and the gang.

"So, these are the fools you speak of?" the dark figure asked another dark figure.

"Yes, they are also friends with those two pests that keep getting in my way and thwarting my plans to take over the world." A second dark figure explained. "So I ask that you could send your men to capture them and keep them out of our way."

"Why bother, they aren't threat to us, since we are in a different planet from them." The first figure said.

"Oh, you don't know how wise they are." The second figure explained. "They may look like foolish inferior creatures, but there is more in them then meets the eye! They might possibly end up finding a way to enter in this world."

"Very well," the first figure sighted. "if these people are as dangerous and a threat to us as you say, then I shall send my best men to hunt them down."

The first figure then raises his hands and lights starts glowing over them, he sends out energy beams into the air and out from the castle they were in and enter through two separate portals. After the last ones went in, the two figures continue watching our heroes through the crystal ball.

"Now, let us enjoy the show." The first figure said.

"He he he, once I are captured, they will no longer become threats to us!" the second figures chuckled. "And then, no one will stop us from ruling the world!"

They both laugh maniacally as we zoom out for a full view of the castle. It was a 3000 tall and it was built on some kind of asteroid, floating over a planet.

A/N: Well, that's the prologue. What is gonna happen to our heroes now? Stay tuned for the next chapter of ROBOTHEDGEHOG II: PRINCESS STAR!! R&R, please.