The Death Egg is a spherical gray space station that resembles the face of Dr. Eggman, with concave eye-sockets, a sharp nose, and a mustache rendered in kilometers of vacuum-hardened plasma-steel. Its exact dimensions, are not known, although it is easily gargantuan; its mass and size are enough to destroy mountains, flatten forests, and push Angel Island into the sea, and its face alone can cover up the vent on the volcano in Lava Reef Zone.
Features and abilities
In Sonic Generations, Sonic went back in time to the time of the West Side Island incident where he got onboard the Death Egg. There, the hedgehog was attacked by that time's Dr. Eggman and his Death Egg Robot. After Sonic defeated the Death Egg Robot however, the Death Egg did not suffer any catastrophic damage. Also, when Sonic tried to help Eggman out of his smashed robot, the Time Eater appeared and kidnapped the doctor.
After the Time Eater was neutralized, the Death Egg most likely had its original fate restored.
Sonic the Hedgehog 3 & Knuckles
In Sonic the Hedgehog 3 & Knuckles, the Death Egg crash-landed on Angel Island. Eventually repairing it, Eggman tried to re-launch the Death Egg, only for it to crash on Angel Island again due to the efforts of Sonic and Tails. Using the Master Emerald however, Eggman got the Death Egg flying again. On its trip into space though, it got destroyed by Sonic and Tails.