Sonic the Hedgehog (Underground)

TV series
Shortly after the triplets' births, Doctor Robotnik seized power of Mobotropolis and converted it into the polluted and metallic city of Robotropolis. A bounty was placed on the children of Queen Aleena who then was forced to take them into hiding. Eventually, the Oracle of Delphius appeared before her with a prophecy which foretold that she would have to separate her children in order save their lives. Aleena sent the siblings to three different caretakers. When Sonic was young, his foster parents were arrested and their home was destroyed. Sonic was taken in by his Uncle Chuck. Sonic would learn how to play an electric guitar that, he soon figured out, could also be a weapon. He then went off to form a band after meeting Sonia and Manic. The Oracle of Delphius reappeared to tell the children of their origins. Shortly afterwards, Dr. Robotnik captured Uncle Chuck, as well as Sonia and Manic's guardians and roboticized them. It was then that the three hedgehog children would form an alliance with each other to locate their missing mother.

Archie Comics
Shortly after Sonic, Manic, and Sonia’s births, Dr. Robotnik would seize power of Mobotropolis and convert it into the polluted and metallic city of Robotropolis. A bounty was placed on the children of the queen, and thus Aleena was forced to take them into hiding. Eventually, the Oracle of Delphius appeared before her with a prophecy which foretold that she would have to separate with her children in order save their lives. Sending the siblings to three different caretakers, Sonic was taken in by his Uncle Chuck. Sonic would learn how to play electric guitar and went off to form a band after meeting Sonia and Manic. The Oracle of Delphius reappeared to tell the children of their origins. Shortly afterwards, Dr. Robotnik captured Uncle Chuck, as well as Sonia and Manic’s guardians and roboticized them. It was then that the three hedgehog children would form an alliance with each other to locate their missing mother.

When Robo-Robotnik v1.0 utilized the Giant Borg, Zonic the Zone Cop would seek assistance from each version of Sonic Prime across the multiverse. Yet because of the overwhelming amount of Zones in the Multiverse, Sonic and his world was overlooked. Because of this, Sonic never received a piece of the Giant Borg when they were distributed to all the Sonics across the Multiverse.

Evil Sonic would appear in Sonic's dimension on a mission from Robo-Robotnik to recover the Giant Borg. Believing Sonic also possessed a piece of the Giant Borg; he located and interrogated him and his siblings. The evil hedgehog departed only for two new Sonics to appear: Sonic Prime and Zonic. Sonic, Sonia, and Manic mistook Sonic Prime for Evil Sonic until the two new hedgehogs explained who they are. Zonic would remark how he had a lack of data on Sonic and his dimension and would request an explanation of their Zone’s history.

Robotnik later appeared in the Giant Borg after recovering the pieces from Evil Sonic. Believing he captured Sonic (after mistaking Evil Sonic for him), he was hoping to find Sonia, Manic, and the rest of their resistance to destroy them once and for all. Sonia, Manic, Zonic, and the Sonics formulated a plan to defeat him. Using himself as bait, Sonic used his speed to distract Robotnik as Sonic Prime and Zonic would climb into the Giant Borg to defeat him. The Giant Borg fired a heat-seeking missile at Sonic which he decided to use to his advantage, running at the Giant Borg as Sonic Prime and Zonic took care of Dr. Robotnik. The missile would destroy the Giant Borg weapon once and for all.

After the battle, Zonic and the Sonics followed Manic and Sonia into Robotnik’s prison where Evil Sonic was located. They would break Evil Sonic out of jail who remarked that they were just arresting him again, which Prime Sonic would point out that it still beats being roboticized. Prime Sonic and Zonic thanked Underground Sonic and his brother and sister before taking Evil Sonic and leaving the Underground Zone. Sonic, Sonia, and Manic were then left to speculate whether they would ever see Prime Sonic and Zonic ever again.

Around the time of Sonic Prime's absence following the Xorda Attack on Mobius, Sonic and his siblings made a visit to Mobius Prime as part of an Interdimensional concert tour.

Due to being part of the old multiverse, it is highly likely that Sonic was wiped from existence when the multiverse collapsed.