Robotnik once used the mind-controlled ape known as Big Daddy to install a laser on top of the mountain, with which he could intimidate and control the people of Mobius. However, Sonic managed to deactivate the laser by draining its batteries.
Main article: Veg-O-Fortress
What exactly Mt. Mobius looked like in its pristine, natural state is not something we ever get to know, for the mountain makes its first appearence only after it has attracted the attentions of Doctor Robotnik. In the style of evil geniuses everywhere, the good Doctor decides that Mobius's loftiest peak would provide an excellent site for another of his evil bases; and the locale is all the more attractive by the fact that Mount Mobius' furious volcanism will provide ample electricity for his deranged schemes.
Thus, by the time Sonic and Tails arrive, the towering spire of rock has been roboticized into the Veg-O-Fortress. This industrialised leviathan includes four distinct areas:
- Toxic Caves (AKA Toxic Pools): Sonic is flushed into a stinky cavern full of toxic sludge and mine carts, which just so happens to be the place where Robotnik dumps all of the industrial waste.
- Lava Powerhouse: Sonic ascends to the next area, a power station of sorts that uses magma and steam energy to run various machines.
- The Machine: At the industrial heart of the Veg-O-Fortress lies an immense, automated Badnik production plant, complete with mass-roboticizer and a central prison for those Mobians yet to be 'processed'.
- Showdown: A launch pad at the summit of the mountain, where Robotnik attempts to escape aboard his spaceship.
After pretty much everything inside the Veg-O-Fortress gets wrecked during the events, Robotnik's artificial facility collapses. Mt. Mobius and the remnants of the Veg-O-Fortress fell beneath the waves. Consequently, the mountain is destroyed, and the title of Mobius' highest peak goes... elsewhere?