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.

The purpose of the Unity Engines is two-fold. First, they open Genesis Portals to bring the worlds in contact with each other. Second, they begin fusing the planets together, allowing Sigma to siphon their energy longer without destroying them in the process. These are, in turn, channeled through a Master Engine which sends the energy into Sigma himself, granting him new powers the more he absorbs.

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 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. Ultimately, they were activated and the planets were fused together, although this also activated secondary programming secretly implemented by Wily and Eggman that had Sonic Man and M'egga Man fighting each other in an attempt to sabotage Sigma's plans.