The is a group that appears in the anime series Sonic X. It is a line of various robot models created by Dr. Eggman to serve as his main soldiers for his attempts at world conquest. While many of them have been fully dedicated to serving their creator, others, such as E-102 Gamma, have rebelled and joined his enemies.
- When Eggman chooses robots with his cards, several E-Series robots (or parts of them) that were never used in the Sonic X series can be seen.
- In the English dub of "Pure Chaos", Dr. Eggman referred to as the E-100 Series as the E-Series. This is an error; in the Japanese version of the episode, Eggman refers to the E-100 Series by their proper designation.