The Egg Dragoon is a giant armored battle mech created by Dr. Eggman.
Shattered World Crisis
During the Shattered World Crisis, as Sonic the Hedgehog was searching the massive body of the Gaia Colossus for Chip and the stolen Chaos Emeralds, he is confronted by Dr. Eggman in his Egg Dragoon. The two arch-enemies engaged in battle with the Egg Dragoon firing a barrage of projectiles at the hedgehog, though Sonic easily avoids them and jumps on top of the mecha to taunt the doctor. Eggman responded to these taunts by driving the Egg Dragoon into the Gaia Colossus hoping to crush and kill Sonic, but it fails. Sonic then tries to think of a way to damage the Egg Dragoon's armor, but Eggman managed to hit him with an ice blast that freezes him solid. The Egg Dragoon moves in for the kill, but night falls and Sonic transforms into a Werehog. Using his enchanted strength, Sonic easily gains the upper-hand and causes the Egg Dragoon to accidentally impaled itself with it's own drill. Sonic then ends the battle by ripping Eggman and his Egg Mobile out of the Egg Dragoon and tossing them into the sky. (StH: #285, #286)