Donatello's portal

Donatello's portal is a portal built by Donatello in the 1987-1996 series. It debutes during season 3, allowing Usagi Yojimbo to visit the turtles Earth.

The turtles later use it to reach the Technodrome. The portal can also be used for travels on Earth, which the turtles use in Muckman Messes Up to quickly reach the Technodrome when it's in the Arctic.