The E-2000 is an advanced combat robot created by Dr. Eggman. Appearing in Sonic Heroes, these foes guard the numerous airships that make up the Egg Fleet. They are humanoid in appearance but capable of transforming into small planes. Both modes can fire a large energy beam at enemies. They are very resilient and can take a lot of damage. This and the shields they carry in humanoid mode make them quite difficult to defeat. They can be disoriented by Sonic's tornado attack, leaving them momentarily unable to shield themselves.
Another version of this robot, the E-2000 R, has a swapped colour palette and is twice as strong as the standard model.