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The Egg Babylon is large and cylinder in shape. It has a grey body, a blue eye, and two spiked balls surrounding it.
The E-73 Egg Babylon was under construction some time prior to Bokkun taking over Dr. Eggman's Fortress. When Eggman and Sonic the Hedgehog broke into Eggman's fortress, they were confronted by a robot. Through the control of Bokkun, it began firing lasers at the two, but with the aid of Eggman, Sonic was able to find a way to get to the top of the Egg Babylon and kick Bokkun off of it.