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The Black Arms were a vicious alien race who once invaded the world.
At one point in the past, the Black Arms invaded the world. They were successfully fought off with the combined might of Sonic, his friends, and even Dr. Eggman and his empire including his Egg Fleet. (StH: #6)
- The Black Arms are based on the species of the same name from the Sonic the Hedgehog video game series where they first appeared in Shadow the Hedgehog’s self-titled spin-off game, Shadow the Hedgehog.
- Professor Gerald Robotnik (Eggman's grandfather) used their blood to create Shadow.