Prehistoric Mobius

Prehistoric Mobius is an alternate/past version of Mobius, known for its volcanic activity and absence of large plant life. Inhabited by Mobosaurs, primitive Mobians, and Overlanders, it's most notable inhabitants are Ivo Robughnik and the Prehistoric Freedom Fighters. It was briefly visited by Sonic the Hedgehog after he was caught in a trap by Dr. Robotnik, and his help got the Freedom Fighters moving along the path to independence in their dangerous world. (StH: #12)