Giga-Bot Prime was a giant battle robot created by Dr. Eggman. After the Xorda invaded, Eggman convinced Sonic the Hedgehog to work for both their benefit by using his super speed to power the enormous machine. Sonic was able to fight off the Xorda spaceship, only for Eggman to pull a double cross by locking Sonic's feet into the machine's pedals. Giga-Bot Prime then carried Sonic and Sally Acorn to the Southern Tundra as it targeted the Quantum Dial, only to be destroyed by the weapon's defense systems. (StH: #124, #125)

Giga-Bot Prime has a similar design to the Über-Bot.