Genesis Portal

A Genesis Portal is a gateway that exists within different realities and allows for traveling between them.

History
The Genesis Portals came into being as a result of Doctor Eggman interfering with Sonic the Hedgehog's attempt to restore their world through Chaos Control. (Sonic the Hedgehog #251)

They were first discover 200 years later by a scientist named Professor Von Schlemmer, who explained to Silver the Hedgehog what they were and what caused them, as well asking him to further investigate the portals.

Silver went back in time and aided Sonic in chasing The Ifrit back through a Genesis Portal that it emerged from as well as explaining the nature of the portals to the latter. Unknown to the two, Eggman was spying on them and thinking of how to use the Genesis Portals to his benefit. (FCBD 2015)