When Sonic and Amy grow closer as an official couple, Sonic meets his lost-long siblings separated from his royal birth, Manic and Sonia. Amy discovers that Sonic was once part of her favorite rock band phenomenon, Sonic Underground, with his siblings. They’ve been searching their missing parents, Queen Aleena, Sonic, Manic and Sonia’s biological mother and King Phonic, their new father, and their little sister, Tania. Sonic, Amy and their friends embark on a journey to reunite Sonic’s royal family and rescue Tania. The three hedgehogs reunite and form a band again to take on Eggman and his new goons and bounty hunters Sleet and Dingo who captured Tania as a family. While along the way, Amy also reunites with her long-lost sister, Emily Rose!
