Another encounter involved the Space Colony ARK, in which Eggman used its Eclipse Cannon to blow up a part of the moon in order to show the world the power that he wielded. These events lead to Sonic and Eggman eventually teaming up to fight a bigger threat. (StH: #5, #6)
Later, another battle happened between Sonic and Neo Metal Sonic - the powered up form of Metal Sonic - who was impersonating Eggman. This time, the fake Eggman was piloting the Egg Emperor mech, but Sonic and his friends defeated the faker, causing him to revert back to normal. (StH: #1, #7)
Later, Eggman built an interstellar amusement park that used the power of the Wisps. Sonic freed their world, Planet Wisp, from Eggman's control and saved the kind creatures, putting a stop to Eggman and destroying his park. (StH: #3)
More recently, after getting ahold of a mysterious artifact known as the Phantom Ruby, Dr. Eggman defeated and captured Sonic and conquered the majority of the planet. Thanks to the help of the Resistance (formed by Sonic's friends and allies and comprised of many more soldiers), other allies, and a past version of himself from an alternate reality, Sonic was freed and helped to stop Dr. Eggman's conquest and save the world from his clutches. This ended in a confrontation between Sonic and Eggman, the latter piloting his latest Death Egg Robot. (StH: #1)
After Sonic managed to defeat Eggman in their previous encounter, the doctor disappeared. However, his robot forces remained, and so Sonic traveled the world to help stop the robot uprisings. When Sonic appeared in a town to help fend off a Badnik attack, he came across civilians in need, one of which attempted to fend off the attacking Badniks to save a group of civilians, but was easily knocked down by an Egg Pawn despite wielding a Wispon. Sonic appeared just in time to save the brave young man and commenting that he knew someone who put a Wispon to good use, which was a nod to one of the Resistance members during Eggman's previous attack. Sonic then ran by the town's militia and told them of the man he just saved and that he needed their aid. Sonic then came across some civilians trying to escape from some Moto Bugs, and he defeated them with ease. Sonic then started to have a little bit of trouble against some Egg Hammers, but Tails appeared and saved him just in time. The two teamed up and took down all of the robots with a mix of attacks, which included the Spin Dash and Rolling Combo. After Sonic and Tails started overcoming the horde of robots, the robots attempted to escape the town, so while Sonic took care of the remaining Egg Hammer, Tails closed one of the town's gates just in time to prevent the robots from leaving, which caused them to crash into the gate and get destroyed. Afterwards, Tails noted that the attack seemed coordinated, which was unlike previous Badnik attacks from other areas. When Sonic suggested it might be Dr. Eggman, Tails did not believe so, as Eggman was known for making sure they knew he had returned before attacking. Sonic decided to continue doing what he had been doing, but Tails expressed his worry over the thought of Sonic losing again, to which the blue hedgehog promised to be more careful. He also suggested that Tails follow him just like old times. Initially, Tails wanted to, but then he decided it was more important to help the town that they had just saved rebuild and recover. Sonic commented on Tails' decision by calling him a class act and stating that they would bash robots again some other time, to which Tails agreed. Unbeknownst to the two of them, a Flapper watched Sonic travel away from the town, which had someone watching the visual feedback and planning their next moves. (StH: #1)
At the neighboring town, Sonic brought down a Death Crab before it could cause any major damage. Amy Rose then arrived and helped finish the Death Crab off. She explained that she heard about Sonic and Tails' latest actions and came by to find Sonic to present him with a request: rejoin the Resistance. The Resistance had their hands full as there were many leftover Badniks from the last major battle against Eggman that were randomly attacking citizens. However, much to Amy's dismay, Sonic declined her offer as, since Tails had theorized that someone was controlling the Badniks due to their more recent organized attacks, he wanted to find out who was controlling the Badniks on his own. (StH: #2)
Sonic and Amy soon discovered that the Death Crab was just a decoy so that more Badniks could invade from the west. While Sonic thinned them out, Amy rallied Wispon-wielding villagers to help destroy the Badniks that reached the town square. Sonic and Amy then continued to destroy more Badniks and find their source, which consisted off Egg Pawns and Egg Walkers. During this time, Amy kept asking Sonic to join the Resistance. Soon, Sonic and Amy discovered a Blowfish Transporter unloading many more Badniks at the edge of the town. With their Croquette Bomber combination technique, the duo took out the Blowfish Transporter. Afterwards, Amy came to terms with Sonic's decision and let him be on his own. Regardless, she requested for him to check on Knuckles the Echidna in a nearby town as she had not heard from him since. Accepting the mission, Sonic set off to find Knuckles, not noticing the Flapper watching from a distance. (StH: #2)
As Sonic arrived at the next town, which was a hub for Wispon distribution, he found that Knuckles the Echidna had already dealt with the Badniks that had been attacking the town. Knuckles explained that the town's Wispon shipments had dwindled, and he had come to find out why. The two entered the town and found its citizens in a panic. They were told that all the town's Wispons had been stolen by a duo of mercenaries that had, before the war ended, driven Eggman's forces away and saved the town, only to then conquer the town and keep its arsenal to themselves. With this in mind, Sonic and Knuckles continued to the town's supply depot-turned-fortress to defeat the mercenaries. There, they encountered a group of captive Wisps being hoarded. Soon, Sonic and Knuckles confronted the mercenaries, who introduced themselves as Rough the Skunk and Tumble the Skunk. A battle ensued between the four, which seemed to be evenly matched until Sonic called upon the help of the Wisps that were trapped within the Wispons that Rough and Tumble had stolen. They broke out of the Wispons and allowed Sonic and Knuckles to easily defeat Rough and Tumble, who were promptly arrested and hauled off to jail. With the town now free, Sonic and Knuckles began partying with the townspeople. (StH: #3)
Continuing his journey, Sonic arrived at the next town where a Buzz Bomber battleship was deploying a stream of Badniks to attack the town. As he entered the town, he reconsidered Amy's invitation to rejoin the Resistance, but pushed that aside. He soon after noticed a ring-tailed lemur fighting the Badniks as well, who introduced herself to him as Tangle the Lemur. Together, they fought the Badniks until they got cornered by a large group of them. Fortunately, Blaze the Cat appeared, and helped them tear through the rest of the Badniks' ranks, including the giant Buzz Bomber. Once the attack had ended, Sonic introduced Blaze and Tangle to each other, and asked Blaze what brought her to his world. She explained she had come to prevent a "terrible event" on his world, as per the Sol Emeralds' directions. Sonic thought she referred to Eggman's global takeover until Tangle brought up the possibility that the organized Badniks could be a sign of something worse coming their way, which made Blaze stay until she understood why she was there. After bidding farewell to Blaze and Tangle, who went to calm the fires in town, Sonic continued his search for the Badniks' ringleader. (StH: #4)
The Fate of Dr. Eggman
Soon, Sonic got contacted by the Chaotix, who needed his help. Meeting up with his escort Espio the Chameleon, the two heroes were forced to clear out some Badniks attacking them - multiple Antons and Hoverby. After that, Sonic was filled in on the Chaotix Detective Agency's activities by Espio, who told him that they had found Eggman, and that he was taking Sonic to him. Arriving in a village, Sonic was introduced to a friendly Dr. Eggman, now going by the name "Mr. Tinker", but scoffed the Doctor's greeting. Learning from the Chaotix that Eggman seemingly suffered from amnesia, and had become a productive member of the village, Sonic began talking with the Chaotix and the village's head about what to do with Eggman since it did not seem right to penalize him now that he was a good man with no recollection of his evil deeds. However, a horde of Badniks soon approached the village. Suspecting Eggman to be behind them, Sonic confronted him while the Chaotix faced the Badniks, only to find a scared Eggman protecting the local children. Convinced now that Eggman was a new man, Sonic helped the Chaotix beat the Badniks. Telling the Chaotix about Eggman, the group decided to leave him to his new life. After properly greeting Eggman, Sonic prepared to leave, but then noticed Eggman mention Eggman Land. Immediately after, Shadow the Hedgehog and Rouge the Bat showed up to destroy Eggman. (StH: #5)
He tried to convince the duo that even if Eggman mentioned Eggman Land, he totally lost his memory and now was helping the residents but Shadow thought that having amnesia didn't make him less dangerous. Finally the two hedgehogs started battling themselves. During the fight, Sonic remembered to Shadow that Eggman helped them saving the world two times: first, stopping the Space Colony ARK from precipitate on the planet; second, he fought back the invasion of the Black Arms. After that, Shadow asked Sonic if he had forgot that the doctor made him suffer and tried to eliminate him plenty of times but Sonic eventually told him that if Eggman couldn't be forgiven, Shadow would have been the same, sice he tried to threat the whole world. Then the hedgehogs returned to the village and forced "Mr. Tinker" to show them Eggman Land, only to discover that is only an incomplete amusement park for the local kids. Mr. Tinker gets forgiven for the mistake and Sonic left the villlage. Meanwhile, the unknown villain prepares to join the Egg Fleet to move on to the next phase of his master plan. However, he is shown to be the possibly actual Dr. Eggman. (StH: #6)
In order to get some information, Sonic reunites with Tails and used the Tornado. While travelling, they spotted a battleship of the Egg Fleet: after getting the Miles Electric, Sonic enters the ship and finds Eggman. But he is a fake: the mysterious ringleader is actually Neo Metal Sonic disguised as Eggman. Neo was supposed to be the doctor's greatest weapon in the final battle but he was completed too late. Since he gained his creator's genius, vision and drive, Neo decided to take over the Eggman Empire and conquer the world for Eggman as him. Sonic engages a duel with him but Neo is able to copy people's abilities and bio-data. After threating Sonic, Neo kept travelling. Sonic told everything to Knuckles and Amy at the Resistance HQ and they decided to search in Eggman's bases to discover which scheme is Neo trying to end. (StH: #7)
Sonic infiltrates one of Eggman's old bases and fights some Spinas, where he meets Silver the Hedgehog, who came back from his future to bring back normal life. Unknown to them, they are followed by a figure who is recognised as the "Guardian Angel": this heroine saved Silver's life more than once and she was sighted by multiple units of the Resistance but never joined the army. The two hedgehogs continue their research and finally meet the Guardian Angel, who wields a particular Wispon. She presents herself as Whisper the Wolf and helps them fighting E-107 Theta. Silver uses a computer and browses the Eggnet: he finds out that Neo Metal Sonic took over Angel Island and the Master Emerald, which calls Knuckles. Sonic contacts the Resistance HQ and alerts them to call everyone. (StH: #8)
Sonic is a tall and thin hedgehog with blue fur and patches of peach-colored skin or fur on his face, arms, and belly. He has six long spines on the back of his head and two more on his back behind his shoulders. His eyes are green. His usual attire consists of white gloves, and his iconic pair of red sneakers with white cuffs around the ankles and white straps across the top, the latter held down by a golden buckle on each foot.
Always prepared to put his life on the line to protect others, be they friends or civilians, Sonic is a carefree spirit and a daredevil at heart with a strong sense of justice, who, unlike most, finds fun in fighting and thwarting evil, primarily in the form of Dr. Eggman and his empire. Despite his usual egotistical and sometimes lazy demeanor, Sonic's defining traits have always been his pure heart of gold and his utter dauntlessness in the face of danger.
Owning to his free-spirited way of life, Sonic values freedom above all else and strives to live his life according to his own rules rather than the standards of those around him or for the sake of heroism and duty. As such, despite his loyalty to his friends and allies, Sonic is typically unwilling to commit to anything that requires him to act primarily under the authority of others, including his friends, believing that he knows what is best for himself.
Sonic's trademark ability is his super speed. He can travel up to speeds surpassing Mach 1, which is at the blistering speed of about 768 mph, and he utilizes this in hand-to-hand combat, giving him quick reflexes. He is also very agile, being capable of performing extreme acrobatic feats. He also has incredible jumping skills: he can set off with enough power to bend thick metal armor and go hundreds of meters into the air with a single jump. While his top speed is unknown, glimpses of Sonic's prowess are shown in his tendency to routinely scale vertical walls, effortlessly knock down enemies in his path, run over water, and plow straight through foes. Sonic can also use the Boost to not only increase his speed but also barge through obstacles in his path.
Sonic has demonstrated complete mastery of his speed at any level. Not only can he run at a maximum tilt in straight lines, but also through sharp turns with full control over his momentum, and without recklessly crashing into unintended targets. As far as stamina goes, Sonic's is seemingly limitless as he is never winded from running.
Sonic's core offensive maneuver is the Spin Attack, a technique where he curls into a concussive ball or cutting disk and directs himself at his targets. With it, Sonic can shred or burrow through just about any substance given enough speed, and perform moves like the Spin Dash, Homing Attack, and Rolling Combo, though the last one requires the aid of his friend Tails.
Miles “Tails” Prower
Tails is Sonic’s oldest and closest friend, to the point that the two can be considered surrogate brothers. The pair have demonstrated near-perfect synchronization in battle whenever paired up, with Tails always being prepared to give Sonic a lift using his flight ability or both combining their Spin Attack to form a stronger Spin Dash. Also, whenever Tails worries for Sonic's well-being, Sonic is quick to give his buddy emotional support and assures him that he'll be fine, even offering Tails to join him "just like old times."
Amy is another close friend of Sonic’s, and the only one who’s known to harbour deeper feelings toward him, feelings that she never tries to hide around him, which often makes him uneasy. Sonic cares very much for Amy, though it’s unclear whether he returns her romantic feelings. Nonetheless, he has a good relationship with her, and with most of his friends, she can be subject to his jokes and teasing.
Knuckles the Echidna
Knuckles is both a close friend and rival to Sonic, with the two of them being no stranger to butting heads over a disagreement at worst, or partaking in banter with each other at best. Despite this, the two put a lot of trust in one another's abilities and work near perfectly to get the job done.
Tangle the Lemur
Sonic and Tangle have been described as kindred spirits due to having similar traits to each other.
Sonic and Dr. Eggman have spent years as archenemies, due to the latter's constant attempts at planetary domination, which Sonic always thwarts, causing him to become a thorn in Eggman's side. The two have battled for the fate of the world under various circumstances, from Eggman's imprisonment of various types of wildlife to the planet's surface being shattered by the Chaos Energy Cannon.
Recently, in an unexpected turn of events, Eggman managed to catch Sonic off-guard and imprison him, allowing him to easily conquer most of the world, though his reign ended when the Resistance freed Sonic and helped him defeat Eggman six months later. When Sonic and Eggman next met, the latter had taken up residence in an idyllic village and was seemingly amnesiac, having no recollection of his past life. Initially, Sonic was left conflicted and doubtful about Eggman's amnesia being genuine, but later decided to restart his relationship with the doctor on friendlier terms after witnessing him in fear from an attack by his own Badniks, which Sonic and the Chaotix stopped.
- Miles "Tails" Prower (best friend, close as brothers)
- Knuckles the Echidna (best friend and rival)
- Amy Rose (self-proclaimed girlfriend)
- Shadow the Hedgehog (comrade and arch-rival)
- Rouge the Bat
- Blaze the Cat (close friend, partner in combat)
- Tangle the Lemur (close friend)
- Silver the Hedgehog (ally and friendly rival)
- Head writer Ian Flynn has revealed on Twitter that Sonic's measurements are the same as those of his game counterpart.