The Unknown Enemy

The Unknown Enemy is a villian in Sonic the Hedgehog: Forgotten Chapters who comes from Mobius A.

= General =

Mobius A
Almost nothing is known about this character. He or she has seemingly always had Mobius A in his or her grasp and is a more potent foe than Robotnik A was. Before Radiation and Robotnik A teamed up, nobody had ever dared to try to reclaim power.

Attempted Coup
Robotnik A and Radiation the Hedgehog put their differences aside long enough to try to take back the land. Unfortunately, they were severely underprepared. They fell into a sealed tube, and the enemy mocked them. T.U.E. told them he or she was sending them to the Zone of Silence and warped them away. They ended up in Mobius Prime instead.

The Hedgehog Came Back
When Radiation was returning to Mobius A, he claimed that he knew now how to defeat the Unknown Enemy. No details of this plan were revealed. It is not known if he was able to, but his confidence going in speaks of his certainty.

Trivia

 * The creator of the comics has stated that the character is not a demon or a human or even an overlander. The two possibilities are Mobian or robot.
 * T.U.E.'s appearance is highly reminiscent of the Grim Reaper.
 * The writer also said that The Unknown Enemy will almost certainly return.