The Egg Missile is a rocket-propelled air/spacecraft built by Dr. Eggman. Like the doctor's Egg Mobile interfaces with various mechanical armatures, the humanoid Egg Bomber mecha interfaces with the Egg Missile. This machine is the first phase of the final boss of Sonic & Knuckles.
With the destruction of the Death Egg, Dr. Eggman attempts to escape into space aboard the Egg Missile. Sonic transforms into Super Sonic (or Hyper Sonic if he has all the Super Emeralds in Sonic 3 & Knuckles) and pursues the doctor through a field of orbiting debris. As he closes in, the Egg Missile fires shots from its pulse cannons and launches homing missiles. These weapons will not kill Sonic but will knock him back. He cannot strike the Egg Missile himself but can lure the homing missiles into the mecha's head. After being hit by 8 missiles, the Egg Missile armature goes down and explodes. The Egg Bomber emerges from the explosion and Super Sonic must pursue it to take back the Master Emerald.