An Omni-Door is a method of transportation that allows its users to travel between dimensions. The gateway presumably works in the same manner as the Omni-Viewer, although it wasn't mentioned to be able to travel through time. The Chaotix Crew were shown to own one in Chaotix Tower and Sonic the Hedgehog discussed the possibility of asking Porker Lewis to build a connecting one on Mobius, allowing easy access to the Special Zone. Despite this, the Omni-Door was never seen again. Charmy Bee visited Mobius in Bee Prepared but did not reveal how he got there.