Sonic the Hedgehog is one of the protagonists in the Nightmare Series games. His body is taken over by Exetior and is locked inside his subconscious by Creep, however, his strength and will allows him to still be alive inside. He is determined to escape from Exetior and save his friends, so he can eventually finish Exetior off and finally put an end to this all. He is voiced by DarkBox.

In his youth, he was a frisky young hedgehog and he was eager to help the Freedom Fighters in with fight against Dr. Ivo Robotnik.

One day, when he broke into the base of the scientist, he found old photos of Ivo and some mysterious, young girl. Near with photos lay some files, inside of them it was written that the mysterious girl was his daughter, Jessy. Sonic read through the files, which, the files revealed that the Mobians had killed Eggman’s daughter, this caused Sonic to take a lot of things into consideration, rethinking most of his actions.