Unity Engine

The Unity Engines are a key component in Sigma's plans for the Worlds Unite story. With them, Sigma planned to channel the energy of the worlds into himself, furthering his twisted ideas of evolution and ultimately to ascend to godhood.

Worlds Unite
The Unity Engines began construction in part 1 of the crossover, constructed by the unwilling Drs. Wily and Eggman by Sigma's command.

Sonic Man (and presumably M'egga Man) were supposed to oversee the arrival of the Unity Engines and activation of the Unity Engines on Earth 20XX and Mobius, respectively, but interference prevented them from doing the latter.