GhostFang is the person that released Exevillion from the Sonic games

He was at the store when he saw a copy of Sonic the hedgehog 2 he bought it and returned home

He played the game for a few minutes until the game glitched out and said "Thank you for letting me out of my PRISON" and then he was sucked into the game and Exevillion escaped.

And now he is trapped within the games begging for help

He will be the reason Exevillion is defeated

But he will be set free in Episode 9 (the episode before the finale)