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Sonic Underground is an animated TV series. And no, you cannot unlock episodes, or characters other than Sonic, from Sonic Underground in Super Smash Bros Brawl.
Sonic only has siblings in the non-canonical TV series Sonic Underground. He has a sister, Sonia and a brother, Manic.
yes i saw a sonic underground sonic plush on ebay.
Just like all the other cool characters Dic made for the sonic TV shows, they were removed. (If you really like them, then I can relate. scratch and grounder were just as cool!)
there is no animated sonic tv series after sonic x. sonic x IS the last sonic TV series.