Unity Engines

The Unity Engines are powerful devices created by Sigma-1 in order to draw upon the power of worlds such as Mobius and Earth 20XX in order to grant him greater power.

Worlds Unite
After conceiving the idea of the Unity Engines, Sigma set Dr. Ivo "Eggman" Robotnik and Dr. Albert W. Wily to work building them in his base on the Lost Hex. As Sigma contemplated the power the engines would grant him, he wondered what his old foe X would think of him after the engines granted him the power of the two worlds he was seeking to conquer. After Sonic the Hedgehog and Mega Man were captured and turned into Roboticized Masters Sonic Man and M'egga Man, each was sent to the other's world with a Unity Engine to place in Mega City and Mobotropolis, respectively. (SU: #76; SB: #8; StH: #273)