Giant Borg

Giant Borg was an immense battlesuit crafted by unknown aliens by another dimension. Unlocked through a device known as the Giant's Hand, it was sought after by the first Robo-Robotnik, who wished to use its power to dominate all the various incarnations of Mobius. Claiming the weapon, he set out on a rampage of Mobius Prime, only to be set upon by an army of alternate Sonic the Hedgehogs. Giant Borg was fragmented by the battle, and each of the Sonics was given a piece of it to take back to their home dimensions in hopes that it would never be reassembled by any evil power. (StH: #19)

Later, Robo-Robotnik recruited Evil Sonic to help him recover the scattered components of Giant Borg, only for him to mistake the Dr. Robotnik of the Sonic Underground universe for him. Robotnik Underground reassembled Giant Borg and piloted it in an attack on his citizens, only for Sonic Prime and Sonic Underground to destroy it by luring one of the suit's own missiles back towards it. Later, though, a component of Giant Borg was used by another Robo-Robotnik as the basis for a new robot body for himself. (SSS: #10, StH: #75)