Sonic Underground was originally planned to have 65 episodes, but only 40 episodes were aired on TV.
65 (I wish they produced them!)
They only appear in sonic underground
2
That is unlikely.
Short Answer: No
No sorry.
In Adventures of Sonic the Hedgehog or Sonic Underground, Sonic original design is in these episodes.
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.
there are only 40 episodes because the show was canceled.
No. The series was due to be 65 episodes long, but was axed at 40 episodes.
yes they did i watch them on netflix
there are 78 episodes of sonic x