I was watching Super Sonic Underground, which, despite it’s name, did not involve Super Sonic.
It was a sequel to Sonic Underground, set several years afterwards, and staring Sonic’s granddaughter (played by Jaleel White). Sonic’s granddaughter was lost in space and trying to find her way back to Mobius. Along the way she met a princess of another planet, who became her friend and sidekick, and was helping Sonic’s granddaughter attempt to get home.
What happened to Sonic, Manic, and Sonia? Did they ever find their mom? We don’t know, but people on the internet are hopeful that eventually Sonic’s granddaughter will find her way back to Mobius and it will be revealed.
The opening and ending themes were sang by Jaleel White in character as Sonic.