After bringing the Technodrome back to the surface, Shredder and Krang trap the Turtles and send them to Dimension X where they become slaves. In the meantime, Shredder and Krang back on Earth once again try to take over the world.
Did You Know?
[the Turtles arrive at the beach, and a tidal wave appears
What is it? A tidal wave?
No, it's uh...
[the Technodrome appears and rolls toward urban Manhattan
... the Technodrome!
Krang used that powercell to re-energize the entire Techndrome.
Man, That thing will roll over the city if we don't stop it!
Relax you guys, we should know the drill by now.
We break into the Technodrome. Fight our way past the Foot Soldiers. Disconnect the power device and escape with it.