Big Arm is a vehicle built and used by Dr. Eggman on a number of occasions.
Dr. Eggman employed the Big Arm during his initial invasion of Angel Island, only for it to be defeated by the heroes aligned against him. It would also appear during his efforts to conquer the world using the power of the Time Eater. He would later employ a rebuilt or duplicate version in his efforts to rescue Metal Sonic from the Distant Abyss Zone, and use it to fight a monstrous creature inhabiting that Zone. (VG: S3&K, SG; StH: #276)
- Before it was utilized in the comic, the Big Arm was featured on the cover of the Villains volume of Best of Sonic the Hedgehog.