The Sonic Underground Zone (sometimes dubbed the Underground Zone) is an alternate dimension with similarities to Mobius Prime and part of the multiverse. Distinctions of this Underground Zone include this version of Sonic having a completely different family, including two siblings named Sonia and Manic, and all being part of a band with each other and of a royal family.
Before Giant Borg
The Underground Zone has a slightly similar past to the Prime Zone in that its version of Dr. Robotnik seized the city of Mobotropolis shortly after Sonic and his siblings were born and converted it into Robotropolis. He would then keep the wealthy around to fund his factories while he roboticized everyone else. He also planned to force Queen Aleena, the current ruler, to marry him in order to legitimize his takeover of the planet. (SSS: #10, CSE)
Aleena also happened to be the mother of three children: Sonic the Hedgehog, Sonia the Hedgehog, and Manik the Hedgehog. She took her children into hiding after a bounty was placed on them, but after being told a prophesy from the Oracle of Delphius that would claim the lives of her children would depend on her giving them up, she was forced to part ways with her offspring. She left them to various caretakers: Sonic to a country family who would later pass him to this Zone's version of Uncle Chuck, Sonia to a kindly aristocrat named Lady Windimere, and Manic to a good-hearted thief named Farrell. All three became accustomed to playing musical instruments and would eventually meet with each other and form a band. The Oracle of Delphius would return, revealing the children’s history to them. After this, Robotnik would capture Chuck, Windimere, and Farrell and roboticize each one of them. The trio would then form a resistance group together and vow to find their mother no matter how long it would take. They would be plagued not only by Robotnik, but also by his top bounty hunters, Sleet and Dingo. (SSS: #10, CSE)
Giant Borg's Attack
During Robo-Robotnik’s attack in the Giant Borg; Zonic the Zone Cop would go and seek assistance from every version of Sonic across the multiverse. Because of the vast amount of Sonics across the numerous Zones, Zonic forgot about the Underground Zone and its local Sonic. For this reason, Underground Sonic never received a piece of the Giant Borg when they were distributed to all the Sonics in the multiverse. (StH: #19, SSS: #10)
Evil Sonic would come to invade the Sonic Underground dimension during a mission from Robo-Robotnik to obtain all the pieces of the Giant Borg. He then proceeded to interrogate Sonic, Sonia, and Manic about the location of their Giant Borg piece, which left the siblings puzzled. After giving up, he would be captured by Sleet and Dingo. Evil Sonic mistook the Underground Robotnik for Robo-Robotnik and hand over all the pieces of the Giant Borg from the other Zones to him. Underground Robotnik likewise mistook Evil Sonic for the Underground Sonic and had him sent away for Roboticization. Robo-Robotnik secretly arrived on the scene to witness these events, abandoned his hopes of recovering the Giant Borg, and departed. (SSS: #10)
Meanwhile, during a concert preformed by Sonic, Sonia, and Manic, Prime Sonic and Zonic showed up searching for Evil Sonic. Underground Sonic and his siblings mistook his Prime-self for Evil Sonic they encountered earlier until Prime Sonic and Zonic explained themselves and their mission. Zonic was surprised about his lack of data on the Underground Zone and its variant of Sonic there and would ask for an explanation of the Zone’s history. (SSS: #10)
It wasn't long until Underground Robotnik stormed the scene in the rebuilt Giant Borg, believing he robotized his version of Sonic and now looking for Sonia and Manik. The two Sonics, Manic, Sonia, and Zonic formulated a plan that required Underground Sonic to lead the Giant Borg away from Robotropolis. The Giant Borg took the opportunity to fire a heat-seeking missile at Underground Sonic. While Underground Robotnik was distracted, Prime Sonic and Zonic would sneak onto the Giant Borg and corner him. Underground Sonic then turned the missile back at the Giant Borg by running towards it, destroying the weapon for good. (SSS: #10)
Afterwards, Sonia and Manic, followed by the Sonics and Zonic, would sneak past Dingo and Sleet and free Evil Sonic from his cell in Robotnik's prison. Evil Sonic then pointed out that they are just freeing him from one jail to put him in another but then Prime Sonic would also point out that this way he wouldn’t be roboticized. Prime Sonic and Zonic would thank the Underground Sonic, Sonia, and Manic before taking Evil Sonic and departing from the Underground Zone. Sonic, his sister, and his brother were left pondering if they will ever meet Prime Sonic or Zonic ever again. (SSS: #10)
- House of Hedgehog
- Dr. Robotnik (Underground Version)
- Dingo (Underground Version)
- Oracle of Delphius
- Uncle Chuck (Underground Version)
- Lady Windimere
- The Sonic Underground dimension is the Archie comic’s embodiment of the "Sonic Underground" TV show plot and setting by DiC. The comic’s backstory of the Underground Zone is exactly the same as the TV show's. Where Archie Sonic the Hedgehog takes elements directly from DiC’s other two Sonic cartoons, "Sonic the Hedgehog" and "Adventures of Sonic the Hedgehog", and places them into the main plot, the entirety of "Sonic Underground" would be placed into an alternate dimension.
- The "Sonic Underground" animated TV show ran from August 30, 1999 to October 22, 1999 and aired a total of 40 episodes. It also shared Jaleel White as Sonic’s voice actor with the other two DiC cartoons.
- In the animated series, this universe also has its own versions of Knuckles the Echidna, King Acorn (in a brief cameo), and even Athair (the only comic-exclusive character ever to debut in animation). It is unknown whether this also applies to other characters in the Prime Zone.
- The characters of Sonia and Manic on the TV show are paid tribute to in the comic book in the form of Sonic and Sally's children, Sonia and Manik, from the various future timelines.
- While the current writer of the comic, Ian Flynn, thinks that perhaps making a new Sonic Underground story that could wrap up where the original series left off is an interesting idea, that he feels he would be "stepping on the original creatives' toes." And that the story probably wouldn't see the light of day for at least two years if he was allowed to do it anyway. (1) It was revealed at New York Comic Con 2012 that Archie Sonic Universe 50 was intended to be the official epilogue of the Sonic Underground series. However, the issue instead featured a plotline starring Metal Sonic, the epilogue was later cancelled.