Sonic and his royal siblings seek to find their mother and defeat the tyrant, Robotnik.
Sonic Underground
HiCartoon is the best site to watch sonic underground online, or you can even watch sonic underground in HD quality. You can watch sonic underground free on HiCartoon website.
Overview:
Sonic and his royal siblings seek to find their mother and defeat the tyrant, Robotnik.
Aired:
1999–2000
Status:
Finished Airing
HiCartoon is the best site to watch sonic underground online, or you can even watch sonic underground in HD quality. You can watch sonic underground free on HiCartoon website.
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