The Evil Turtles rob a bank on their Earth.
An alternate Earth appears in the Fleetway Comics issue Turtles of Terror.
It is identical with Earth, except for some differences. On this Earth, the Turtles are criminals. Using the Technodrome scanner, Shredder detects the alternate Earth, where the Turtles are seen robbing a bank with rifles.
Shredder uses the portal to bring the Evil Turtles into the Technodrome. He tells them that if they want to return to their home, they must follow his orders. Shredder says they are to impersonate the Teenage Mutant Hero Turtles and destroy them.