Season 3, Episode 47 - "The Big Blow Out"
22 December, 1989
The turtles thought the Technodrome, along with Krang and Shredder were gone; Before it came right back up out of the earth and ambushed them with rockets. While the turtles and Master Splinter are trying to find out what Shredder and Krang up to, they quickly discover that their enemies are after the antenna at Mount Rushmore: An antenna that could suck the world of all its energy. Though, they don't find out Krang's true intentions until he uses the city's highest sky-scraper, the World Trade Building, to open a giant trans-dimensional portal to Dimension X.
