no
he did not
Yes.
Dr. Eggman kept him.
Chris assumingly went back to his home planet.
In Sonic X, Sonic lives in a parallel version of Earth, while Chris lives on the other Earth.
Sonic X - 2003 The Lost Planet 3-22 was released on: USA: 8 April 2006
Sonic and friends lived on a fantasy version of our Earth. Some of the japanese classic game manuals already confirmed it. Their home planet is mostly mistakened to be a parallel version of Earth(Sonic X), Mobius(DIC and Archie), and sometimes planet Freedom(Sonic the Movie)
No in fact it was considered to be the a******* planet but other than that it was found
No
Sonic is referred to as 15 in all of the modern media he's related to.
Only Amy hugs Sonic, and Sonic doesn't hug her back.
She Appears in episode 39 of sonic x near the end of the episode.
i know its sometime in season 3 i think its in episode 2 of season 3