Sonic Underground

"‘Triplets born, the throne awaits,’ a seer warns of a deadly fate, ‘Give up your children, separate, bide your time, lie in wait!’"

- Sonic Underground opening theme

Sonic Underground is the family ship between Sonic, Sonia, and Manic from the Sonic the Hedgehog fandom.

Canon
Sonic, Sonia, and Manic are triplets of Queen Aleena Hedgehog. They were separated after a prophecy reveals the future of the royal family. They were entrusted with medallions that can turn into musical instruments. Sonic was taken under the care of Uncle Chuck after the former's foster parents' home burned down, Sonia was raised in an upper-class society, and Manic by street urchins. Early in the series, the oracle reveals that their caretakers have been roboticized by Dr. Robotnik, and is the right time to unite as members of a band.

Throughout the series, the trio have sought clues to their mother's whereabouts, while being antagonized by Dr. Robotnik, Sleet, and Dingo, among other characters. They have also sought the help of others such as Sonia's former fiancé Bartleby, Knuckles, and half-roboticized anthromophoric animals in the desert.

The series ended in a cliffhanger, uncertain if they will reunite with their mother, defeat Dr. Robotnik once and for all (as in the case of Sonic SatAM), or restore their rightful title.

Comics
The trio have a major role in Sonic Super Special issue 10, where they helped Prime Sonic and Zonic defeat the Giant Borg.

They visited Prime Sonic's world as part on inter-dimensional tour in issue 144 while the hedgehog was out in space after an attack by the Xorda.

Fanon
As with the eponymous television series, there is some following.

Despite being from an alternate dimension, numerous fan fictions would incorporate Sonic's siblings alongside characters in the games and/or comics.

Fandom
FAN FICTION

DEVIANTART

WIKIS
 * on the