Eggman Upgrades Metal Sonic

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The Black Arms were a vicious alien race who once invaded the world.

The invaders were fought off with the combined might of Sonic, his friends, and even Dr. Eggman. (StH: #6)

Background Information

  • The Black Arms were the main villains of Shadow the Hedgehog’s self-titled spin-off game.
  • Professor Gerald Robotnik (Eggman's grandfather) used their blood to create Shadow.