Classic Sonic (SUT)

Classic Sonic is Sonic's past self and is not from an alternate dimension and his later events in his life can be found here

Starting out
Before he was Sonic the Hedgehog, he was named Nicky, Nicky Maurice the Hedgehog, and was picked on a lot. As long as he can remember, he has lived with Longclaw, who was his caretaker when his mom had to give him up to complete a prophecy, along with her, Dr. Kintobor was also his friend, who he met by accident. But another accident seemingly killed Kintobor, so he went back to having Longclaw as his one true friend, but that too didn't last long, as his power were found out by power-hungry bad guys, and had to leave Longclaw behind... The rest of that spoils the 2020 Sonic Movie, go watch it to see what happens next

Sonic 1 (16 bit + 8 bit)
Sonic later went to South island, only to find that Robotnik has returned, and has turned all the Animals into evil robots named Badniks, as well as trying to find the Chaos emeralds. Fortunately, Sonic collected all the Chaos emeralds and defeated Robotnik. But after his latest adventure, Sonic didn't know what to do with them, same with his friends Johnny Lightfoot and Porker Lewis. Suddenly the Emerald's radiation levels grew and soon disappeared in a large blast of Chaos energy, which Sonic took the full blast of. Sonic then turned Yellow, and his eyes went crazy, he had turned Super Sonic for the first time, and flew away from South island to Westside Island, only stopping when he hit a tree. Shortly after, he saved a fox cub named Miles Prower, who renamed him Tails, due to his 2 tails, as well as having him as his sidekick, here we Bleed into the next game...

Sonic 2 (8 bit )
Sonic brought Tails back to South island to keep him safe while Robotnik still tries to take over the island. But a few days later, Tails was gone, and in his place was a note that said "Dear Sonic, I have cidnapped your 2 tailed friend, if you want him back, you must give me all 6 chaos emeralds, oh, and don't think it'll be that easy, as I've invaded the zones leading to my base with my new Super Badniks! Try not to die too easily! HAHAHAHAH

-Signed, Dr. Ivo Julian Robotnik"

Sonic quickly took action, collecting the chaos emeralds while also destroying Robotnik's super Badniks, and eventually Silver Sonic! His evil robotic doppelganger, and while threatening on paper, Silver Sonic was easily destroyed, and Sonic got the last Chaos emerald from him, opening the gates to the Crystal Egg Zone, where Sonic eventually fought Robotnik and defeated him. Sonic gave chase, but Robotnik escaped into a teleportation device. Sonic thought that Tails was gone forever, but Robotnik kept his promise, as Tails appeared a few seconds after, and they went back home, happily reunited. Unfortunately, Robotnik wasn't done yet...

Sonic Chaos
Robotnik has stolen one of the Chaos emeralds, making them unstable and making South island slowly sink into the ocean. Sonic and Tails dash into action, collecting the chaos emeralds, Deroboticizing Green hill zone (Mecha Green Hill) and eventually their way to the Electric Egg zone, where they fought Robotnik in his Egg walker, but even that was no match for Sonic and Tails, thus causing Robotnik to flee, which caused him to drop the last Chaos emerald. Sonic then used it's power to stop South island from sinking into the sea, as well as wipe out all of Robotnik's bases. Sonic, thinking that Robotnik was squashed once and for all, decided to have a vacation at Westside Island.

Sonic 2 (16 bit)
While relaxing on Westside Island, Sonic heard that a Chaos emeralds are on Westside Island, thus making the Emerald count to 7, rather than 6. Unfortunately, Robotnik has also been notified of this, and sets out to get that last Chaos emerald to power his Death Star rip-off, the Death Egg! So while Sonic isn't noticing, he quickly builds bases to work on it, Chemical Plant Zone, Oil Ocean Zone, Metropolis Zone, and Wing Fortress. Sonic does hear about this thanks to the Badniks invading the non Industrial Zones. Sonic and Tails once again stop Robotnik from invading the rest of the Zones, as well as see a glimpse of their next adventure together.

Eventually Sonic and Tails got to the Sky Fortress, but while landing the plane, a laser shot it down with Tails piloting it. Sonic then went Super Sonic again, and tore down the fortress, but luckily he turned back to normal just in time for Tails to return with a fixed Tornado (The plane)! They flew up to the sky, and Sonic latched on the the Rocket ship that Robotnik was escaping in.

The rocket soon went into the Death Egg and Sonic gave chase, but was locked in an arena with none other than the new and improved Silver Sonic! But history repeated itself, as Silver Sonic was destoryed once again.

The doors opened, and Robotnik was in the other room, knowing that Sonic would try and capture him, he did the most reasonable thing that he could do... RUN!

Sonic gave chase, almost catching him until Robotnik jumped into his deadly Death Egg Robot!

Luckily Sonic used his wits, and looked for openings for attacks, hitting him while landing, in the back, even while he's moving! Then Robotnik tried to hit Sonic with his arms, but Sonic directed them to conveniently placed mines, allowing him to hit the head, eventually the mech suit fell. Robotnik then asked Sonic to help him, but the Death Egg was about to blow causing Sonic having no time to help him (That and the time eater took the evil Scientist).

Sonic then fell back down to Mobius and to his doom until Tails flew under him with the Tornado, saving Sonic. They later went back down to Westside Island for a celebration party from freeing Westside island from Robotnik's rule, and then went to Knothole Village after the party and had a bit of a break until he heard an SOS call from an Unknown island...

SegaSonic the Hedgehog
Turns out that it was a trap, as Sonic was captured by Robotnik on the unknown island known as Robotnik island, a tourist trap that's actually a trap!

Robotnik sent Sonic into a Jail cell with his other captives, Mighty and Ray, but using their combined Strength, they escaped their cell, only to be launched further into the island.

After braving all the traps the island had in store, the trio eventually got to Robotnik's headquarters, which he self destructed once they got to his office. Luckily, the trio escaped alive, and went their separate ways.

Sonic CD
Hearing the news about Little Planet, Sonic dashed along to actually get a break. But unfortunately, Robotnik was back, and had Roboticized and chained The Little Planet. Sonic ran up the chain, and went through the planet's zones, and there he met his Self-proclaimed Girlfriend, Amy Rose (Aka, Rosy the Rascal), who was kidnapped by a new Metal Doppelganger, Metal Sonic. Sonic reluctantly ran to save her, along with destroying all of Robotnik's generators and Metal Sonic projectors, as well as getting the Time stones. Sonic then saved each Zone, beat Metal Sonic in a race, saved Amy, and defeated Robotnik. But unfortunately, Sonic was stuck on Little planet after Robotnik's defeat with Amy Rose for a month.

Sonic 3&K
One month later, Sonic and Tails went to investigate a fallen Floating island known as Angel island, but when they get there, it isn't floating, and the guardian of the Island, Knuckles the Echidna, stole the Chaos emeralds that Sonic had, and took off. Sonic and Tails then chased after him, destroying Badniks and Fighting Robotnik along the way, and every time they seemed to catch up to Knuckles, but the Echidna kept using the islands traps to slow them down.

Eventually, Sonic and Tails got to the Launch Base Zone with the Chaos Emeralds in tow, and proceeded to shut down the Death Egg once and for all, unfortunately, they were too late, and the Death Egg was ready for Launch. But after a fight with the Big Arms, the Death Egg started to fall back down and into the volcano that held the Lava Reef Zone and Hidden palace. After speeding through the Mushroom hill Zone, making sure not to fall off the Flying Battery, braving the sands and ghosts of Sandopolis, and eventually getting to the Hidden palace where Robotnik used the power of Sonic's chaos Emeralds to restore the Super Emeralds, and then betrayed Knuckles by having Mecha Sonic the Master Emerald.

Knuckles, now seeing the error of his ways, helped Sonic and Tails chase down Robotnik by using a teleportation device to The Sky Sanctuary (Note, where Knuckles left Sonic and Tails in the original game, Knuckles follows them throughout the zone) But before they could reach the Death Egg, Mecha Sonic appeared, and tried to stop them from getting the Death Egg.

It was a hopeless battle, until Sonic used the Master Emerald (Mecha Sonic set it down on a device to teleport it to the Death Egg) to turn into the Deadly Super Sonic! And easily destroyed Mecha Sonic and then went to attack Knuckles before going back to normal.

Sonic and Tails then ventured through the Death Egg and soon caught up to Dr. Robotnik and fought his new Death Egg robot, but even after destroying his Robot and Death Egg, Robotnik still got away with the Master Emerald. Sonic told Tails to go to a space shuttle to escape while Sonic stayed behind to turn into Super Sonic, but with the power of the Super Emeralds, he turned into Hyper Sonic (Basically like the Hyper Sonic in the canon series) and fought Robotnik in his prototype doomsday Machine and brought the Master Emeralds and Super Emeralds back to Knuckles, starting a friendly rivalry with the Echidna.

Sonic 3D blast: Flickies island
A couple months after Robotnik's reign of terror ended, Sonic decided to visit Flickies Island due to