I Think it was knuckles or it could if been Dr. Robotink still alive but i think it was Dr. Robotink because on sonic underground he was alive but on sonic underground when you saw sonic and his brother and sisther as babys and kids that was a flashback.But still after sonic was gone from the freedom fighters on sonic the hegehog series. He saw his brother and sisther on sonic underground and Dr. Robotink so he was alive o one thing Dr. robotink is eggman theres your anwer. From Byron Morgan Jr.
sonic the hegehog only black and red (and its shadow not shade)
green
Naugus' eyes
sonic epilouge is a short movie on newgrounds I'm not gonna say anymore go search for it on newgrounds pick the video where it shows sonic with red eyes
Shadow the hedgehog is black with red on his spikes. He has shoes that make him look like his actually skating. He's got some white fur on his stomach. Other than Sonic, he has rings around his ankles and wrists.
His eyes are red.
Red and black bowser, Metal sonic, The black thing with eyes and a mouth, and the pumpkin thing.
No not at all. He just has red eyes that's all. He has power he does not turn evil.
Sonic's blue not red, therefore you can't.
He looks like color blue with red eyes he can fly and Sonic always fights with him to tell you so he doesn't have speed shoes cause HE CAN GO FAST AS HE CAN!
Red sonic underwear was created in 1994.
ho is the guy in the red jacket in sonic