Cosmic Interstate

The Cosmic Interstate is series of pathways connecting the various Zones and parallel universes that Sonic the Hedgehog and his friends often end up in. Accessible through a number of methods, including the portal in the Secret Zone, it has been used by Sonic and others on a number of occasions. It is patrolled by the Zone Cops of the No Zone under the leadership of Zonic, and was once devastated by an attack from Mammoth Mogul before being restored by Titan Tails. Later, it was placed under heavy lockdown as the Zone Cops became embroiled in a war with the evil Dr. Nega.

History
Sonic first named the Cosmic Interstate when he attempted to use it to shut down a factory that Dr. Robotnik was using to pollute a river. By accident, he wound up on Anti-Mobius instead, and met his counterpart Evil Sonic for the first time, sparking a rivalry that would continue for years. After his first defeat of Evil Sonic, Sonic made his way back home through the interstate. (StH: #11, )