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Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
E-66 Da-Dai-Oh looks like a large metallic dome with legs, arms, and a head where Eggman is seated. It had extendable arms and spiked balls for hands. It stands a hundred meters (about three hundred feet) tall and weighs a thousand tons.
Chaos Emerald Saga
When Eggman ordered Decoe to unpack a heavy snapsack, the E-66 reveals to be his Selection Machine. Eggman uses it and it spins on E-66 and so he summons it from his Egg Fort II. Eggman, Decoe and Bocoe used it to ambush Tails, Cream, Cheese, Christopher Thorndyke, Frances and Danny believing that they had a Chaos Emerald. As the heroes denied it, E-66 proceeds to attack them but fortunately for the heroes, the colossal robot slipped on the slippery mud, crashing into the nearby river.
Later on, Eggman orders Decoe and Bocoe to clean out the dirt covering E-66 and just when they are done with that task. Sonic approaches the trio of villains and questions them of their presence which the trio replied they simply need a vacation out in the open nature. Eggman then orders E-66 to attack Sonic which the blue hedgehog evades it with ease. Sonic proceeds to destroy it by charging into it, sending the trio of villains flying into the horizon.