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Krang's mobile fortress is built out of titanium by Foot robots, on Krangs request, in the 1987-1996 series episode Turtles at the Earth's Core. It occurs in the underground dinosaur cave at the core of the Earth.
Assisted by the dinosaurs, the Turtles attack and infiltrate the fortress at the end. Krang, Shredder, Bebop and Rocksteady use the fortress to return ot the Technodrome.[1]
The fortress is never seen in the series again.