Sonic the Hedgehog (Classic)

SegaSonic the Hedgehog
Sometime in the past, Sonic befriended Mighty the Armadillo and Ray the Flying Squirrel, who joined the hedgehog on an adventure to escape Eggman Island and take down Dr. Eggman after the doctor captured and imprisoned them.

Sonic Generations
In Sonic Generations, while running through Green Hill, Sonic witnessed the arrival of the Time Eater, who sent him and Tails to the White Space. There, he briefly met another Tails (whom he mistook for his own) before setting out to restore the victims of the Time Eater, who had been caught in the White Space and turned into colorless statues, by passing through the frozen areas in the White Space. What Sonic did not know however, was that Modern Sonic, a future version of Sonic from another dimension, was doing the same thing. When Sonic and Modern Sonic passed through a Boss Gate, however, they came across each other, where Sonic went ahead and fought Dr. Eggman when the doctor appeared, only to see him get caught by the Time Eater. After that, the Sonics discovered with the help of Modern and Classic Tails that they were travelling through time and space.

Teaming up to stop the Time Eater, the Sonics progressed through the White Space, restoring the frozen areas and their friends. Along the way, they learned from the Tails' that the Time Eater's actions ripped space apart, that their speed was the key to restoring space and time and finally, the Chaos Emeralds were the Time Eater's weakness, which they set their sights on collecting. When Modern Sonic later defeated Dr. Eggman in his Egg Dragoon, Sonic and his friends witnessed Eggman getting caught the Time Eater again, much to their confusion.

The Sonics eventually obtained all the Chaos Emeralds and freed their friends before facing the Time Eater in its own domain. There, Dr. Eggman and his time-space counterpart, Classic Eggman, revealed themselves as the ones behind the Time Eater in an attempt to erase the Sonics from history so that the doctors would be victorious in the present. The two Sonics squared off against the Time Eater, but got knocked out. While passed out, however, the Sonics got support from all of their friends, allowing the Chaos Emeralds to activate and transform them both into Super Sonic. Together, they defeated the Time Eater and stopped the doctors' plan. As a result, time was restored and the Sonics were sent to Modern Sonic's world with their friends where Modern Sonic's birthday party left off. After showing his Modern counterpart that he had begun picking up the Boost, Sonic and Classic Tails returned to their world through a Time Hole left behind by the Time Eater, although not before Modern Sonic promised Sonic that a great future awaited him.

Sonic the Hedgehog 3 & Knuckles
In Sonic the Hedgehog 3 & Knuckles, Eggman set out to re-launch the Death Egg from where it had crash-landed on Angel Island. Having detected the hubbub on an island, Sonic and Tails went to investigate, eventually discovering Eggman's operations. The pair would go on to engage Eggman's forces and Knuckles the Echidna, the guardian of Angel Island who had been tricked into thinking by Eggman that Sonic was out to steal the island's Master Emerald, in battle on several occasions. After making the Death Egg crash on Angel Island again when it tried to re-launch, Sonic and Tails set out to destroy the Death Egg for good, convincing Knuckles about Eggman's true nature along the way. After Eggman then stole the Master Emerald and used it to re-launch the Death Egg, Sonic and Tails would defeat Eggman, destroy the Death Egg and get the Master Emerald back to Knuckles. Sonic soon after lent Knuckles a helping hand when the Master Emerald got stolen by Eggman's robots.

Sonic Mania
In Sonic Mania, some time after saving Angel Island, Sonic and Tails were relaxing when the fox cub picked up a strange energy reading coming from Angel Island. Tails subsequently convinced Sonic to investigate the power source with him. Upon their arrival, they found five Egg-Robos called the Hard Boiled Heavies excavating the island already. The robots soon found a mysterious gemstone called the Phantom Ruby and activated it, causing Sonic, Tails, and Knuckles, who was resting nearby, to get teleported away. The trio ended up in Green Hill Zone, along with the newly upgraded Egg-Robos, who retreated with the ruby, leaving Sonic and co. to chase them down.

The trio was eventually attacked by Dr. Eggman and his Death Egg Robot. Even so, they managed to defeat Eggman, causing him to fall into a hole. Following Eggman, Sonic and co. saw Eggman take the Phantom Ruby from the Hard Boiled Heaves, who had begun to disobey him. Once Eggman obtained the ruby, Sonic, Knuckles and Tails got sent to Chemical Plant Zone by the gem's power. Not set back by their displacement, Sonic and co. continued their pursuit of Eggman, occasionally clashing with the Hard Boiled Heavies and other foes along the way. Whenever they caught up to Eggman however, the doctor either gave them the slip or sent them away with the Phantom Ruby.

Along the way, Sonic, Tails and Knuckles found out that Dr. Eggman had used the power of the Phantom Ruby to make Little Planet reappear in its mechanized state. There, Eggman and the Hard Boiled Heavies housed a new base of operations: the Titanic Monarch. Eventually, the trio made their way to the heart of the robotic area where they faced Eggman in his Phantom Egg mech and four of the newly upgraded Phantom Heavies. When Sonic and co. managed to defeat Eggman, the Phantom Ruby reacted violently and transported Sonic and Eggman to another dimension. The leader of the Hard Boiled Heavies, the Heavy King, was present here too and was now upgraded to the Phantom King. He took the Phantom Ruby for himself but Eggman, who was not prepared to lose the ruby so easily, faced the traitorous robot in his Klepto Mobile. Knowing he had to combat them both, Sonic used the Chaos Emeralds to become Super Sonic. He managed to defeat both Eggman and the Phantom King and then reverted to his normal state. The Phantom Ruby subsequently reacted to the Chaos Emeralds' power and took Sonic with it through a warp, heading towards places unknown.

Sonic Forces
In Sonic Forces, Sonic arrived in Modern Sonic's world through the warp the Phantom Ruby took him through. Since his last visit however, Modern Sonic had seemingly been killed by Dr. Eggman's right-hand man Infinite, allowing Dr. Eggman and his army to conquer over 99% of the planet. Upon his arrival, Sonic saved Tails by dispatching a Chaos replica when it attacked the fox cub. Getting reacquainted with Tails, Sonic confirmed Tails' theory about how he got here, learning in the process that this world's Eggman had obtained the Phantom Ruby and used it to conquer the world. With Tails believing that Sonic had arrived for the purpose of saving the world, the two of them set out to end the war between the Eggman Empire and the Resistance.

Setting their sights on defeating Eggman and learn the secrets of the Phantom Ruby in order to get Sonic home, Sonic and Tails tracked Eggman to Green Hill. There, they eavesdropped on a conversation between Eggman and Infinite, from which they learned that Infinite had harnessed a Phantom Ruby prototype, that Modern Sonic was still alive, and that Eggman was preparing a plan that would wipe out the Resistance. After Infinite took his leave, Sonic made his move and defeated Dr. Eggman when he tried to leave. However, the doctor soon made his escape, although not before warning Sonic and Tails that his endgame would be ready in three days. Seeking now to tell Modern Sonic about Eggman's endgame, Sonic and Tails went to where Eggman mentioned that Modern Sonic was: Mystic Jungle. While looking around for Modern Sonic, the duo met the Avatar, a rookie member of the Resistance, who took them to the Resistance HQ. There, Sonic had his reunion with Modern Sonic while Tails informed everyone of Eggman's endgame.

After the Resistance's Operation Big Wave went down the drain thanks to Infinite and his Phantom Ruby prototype, the group found it necessary to uncover the Phantom Rubies' secrets. As such, Sonic and Tails went to Chemical Plant to search Eggman's database for intel. Eventually, they discovered that the Phantom Rubies required a huge amount of energy, which only Eggman's new Death Egg could provide, to work. As such, the Resistance set out to destroy the Death Egg. After weakening the Death Egg's defenses, Sonic was sent onboard the Death Egg to blow it up, which he accomplished in spite of some unexpected opposition. However, the Resistance discovered while attacking Metropolis that Eggman had built a backup reactor for the Phantom Rubies underneath the Eggman Empire Fortress.

Eventually, Sonic took part in the final battle between the Resistance and the Eggman Army at the Eggman Empire Fortress, which the Resistance sought to break into in order to destroy the backup reactor and win the war. Just as Sonic and the others got pushed back by Infinite however, [./https://sonic.fandom.com/wiki/E-123_Omega Omega] came and distracted the villain. After that, Infinite put Eggman's endgame into effect: using his Phantom Ruby prototype, he created a virtual sun above the planet to drop on the Resistance with and kill them all. While Sonic awaited the outcome however, the sun was neutralized by the Avatar. Now able to continue the fight without worry, Sonic looked for a way into the fortress after Modern Sonic and the Avatar took care of Infinite for good. Eventually, he found a secret passage, which Modern Sonic and the Avatar used to reach the backup reactor and destroy it.

Sonic and Tails subsequently rejoined Modern Sonic and the Avatar, only for Eggman to reveal that the backup reactor was a decoy and that the real Phantom Ruby had been incorporated into his triumph card: the Death Egg Robot. This meant the Ruby had no weakness anymore. With the Eggman Army on the rise, thanks to the Ruby, Sonic, Modern Sonic and the Avatar fought Eggman. Destroying the robot, the trio ensured the Resistance's victory over the Eggman Empire. With the Phantom Ruby now gone, however, Sonic found himself getting pulled back to his dimension in the aftermath. As he faded back home, Sonic bid farewell to Tails and the Resistance. Modern Sonic, however, was sure that they would meet again.

Sonic Mania Plus
In Sonic Mania Plus, Sonic had just returned to his world from his adventure in Modern Sonic's dimension. Upon his arrival however, he discovered the Phantom Ruby had survived and followed him home. As Sonic attempted to retrieve the ruby when it floated away, he came across Mighty and Ray, both of whom were trapped in a capsule. After Sonic freed the duo though, the Heavy Magician revealed herself to be one of them in disguise. She immediately after took the Phantom Ruby and left. Though Sonic and his companion gave chase, they were too late to stop the Heavy Magician from using the Phantom Ruby to revive the [./https://sonic.fandom.com/wiki/Hard_Boiled_Heavies Hard Boiled Heavies] who had been destroyed. The robots' resurrection also warped them all to Green Hill Zone. There, the revived Hard Boiled Heaves ran off with the Phantom Ruby. Sonic thus set off in search of the Phantom Ruby again, but with Tails, Knuckles, Mighty and Ray by his side.

The group was eventually attacked by Dr. Eggman and his Death Egg Robot. Even so, they managed to defeat Eggman, causing him to fall into a hole. Following Eggman, Sonic and co. saw Eggman take the Phantom Ruby from the Hard Boiled Heaves, who again refused to obey him. Once Eggman obtained the ruby, Sonic and his group got sent to Chemical Plant Zone by the gem's power. Not set back by their displacement, Sonic and co. continued their pursuit of Eggman, occasionally clashing with the Hard Boiled Heavies and other old foes along the way. Whenever they caught up to Eggman however, the doctor either gave them the slip or sent them away with the Phantom Ruby.

Eventually, Sonic and co. found out that Dr. Eggman had used the power of the Phantom Ruby to make Little Planet reappear in its mechanized state again. There, Eggman and the Hard Boiled Heavies had rebuilt their base of operations: the Titanic Monarch. Eventually, the heroic group made their way to the heart of the rebuilt Titanic Monarch where they faced Eggman in his Phantom Egg mech and four of the recently re-upgraded Phantom Heavies. Despite the odds, Sonic and co. managed to defeat Eggman, resulting in the Phantom Ruby creating a rift that began devouring the Titanic Monarch. Assuming their Super States with the aid of the Chaos Emeralds however, Sonic and his group escaped the rift, whereas Eggman got swallowed by it. Afterward, Sonic and co. closed off their adventure with a trip to an ice cream parlor, only for the Heavy King to make an appearance and surprise them with a sundae.

Sonic Mania Adventures
After foiling the plans of Modern Eggman, Sonic returned to his own dimension and found himself on Angel Island, which he discovered was full of holes that had been dug by someone. Noticing then Dr. Eggman fly by in his Egg Mobile with a batch of Flickies trapped in a Capsule, Sonic hurried off to rescue the critters. Finding the Capsule in a clearing, Sonic got past the spike traps surrounding it and opened the Capsule, freeing the Flickies. The Capsule, however, was a trap, which flung Sonic into another trap that tied him up by the leg and left him dangling in front of the Capsule, which turned into a timed bomb. Eggman then appeared to gloat at the doomed Sonic. When Eggman was about to leave, however, Sonic managed to lure the Doctor into his own trap by tempting him to steal the Chaos Emerald he had. Escaping from Eggman's trap, Sonic was ready to leave Eggman with his bomb, but was then guilt-tripped by Eggman. Before Sonic could free him however, he found Eggman's handheld which revealed that Eggman had four Chaos Emeralds and that he planned to cheat Sonic out of his to complete his collection. Sonic thus accelerated the countdown on Eggman's bomb and left Eggman to have his bomb blow up in his face.

Sonic soon after met up with Tails and filled him in on what Eggman was up to. No sooner however, Sonic went ahead without Tails to check out an explosion nearby. At the site, Sonic found Eggman excavating another Chaos Emerald. Sonic tried to stop Eggman, but was easily repelled by the Doctor's excavation mobile. Sent flying back to Tails, Sonic accepted the fox cub's aid when he offered it, and together, the two of them took on Eggman. During their battle, Sonic was almost done in by Eggman, but was saved by Tails in the nick of time. After he and Tails finally brought down Eggman. Tails found the Chaos Emerald Eggman had been looking for. With two Emeralds secured, Sonic and Tails celebrated their victory.

Later on, Sonic and Tails would track down Eggman's base of operations and rush off to take on the evil doctor. As they arrived, they were briefly trapped by Metal Sonic and had their Chaos Emeralds taken away. Metal Sonic then used their Emeralds and those provided by Eggman to empower himself and take Sonic on. Fortunately, Sonic and Tails soon found allies in Mighty the Armadillo and Ray the Flying Squirrel, who would help them fight the evil robot. When they began to lose, Sonic noticed that Tails had an idea and began distracting Metal Sonic while Tails went to work. In the end, Tails managed to trap Metal Sonic and strip him of the Chaos Emeralds. With Eggman's aid, however, Metal Sonic attempted to harness the power of the Master Emerald, which Eggman had procured, to finish off the four heroes. However, the villains were stopped by Knuckles, who took back the Master Emerald. Soon after, Sonic joined Tails, Mighty, and Ray on a chili dog picnic.

Later on in winter, Sonic dumbfoundedly watched Amy Rose return an abandoned Metal Sonic to Dr. Eggman. Offering no other response, Amy simply gave the unamused Sonic a flower.