It's the 3rd Sonic The Hedgehog show, this time Sonic has a brother and a sister, Sonya and Manic,
this was an A-OK Sonic had it's good points and bad points, but the plot and story line were enough to keep it going for a few years, sadly the tv networks didn't give it a chase. But it was really a good show, it had mystery, war, sadness, action, comedy, brother and sister hatred! and to top it off
you got a song in every episode, some were very lame but, hey it's a kids show and kids need to learn things, but some of the songs were very catchy and the music was sweet!!
The main plot of the show was that Sonic, Manic and Sonia are really royalty. Their mother is Queen Aleena she is rarely seen in the cartoon it was shown in french but called sonic the rebel

Theme Song Lyrics

Triplets Born
The Throne Awaits
A seer warns of a deadly fate
Give up your children
Bide Your Time
Lie In Wait
Sonic Underground (Sonic)
Sonic Underground (Sonic)
They made a vow their mother will be found

The children grow
Learn what's right
Leaders of the freedom fight
They seek their mother
She knows they do
It is time if she only knew
Will the prophecy come true?
Sonic Underground (Sonic)
Sonic Underground
Queen Aleena: "I long for my children but I have to wait.
To act too soon could seal their fate!"
They made a vow their mother will be found
Sonic Underground!