E-104 Epsilon (Archie)

E-104 Epsilon was the fourth of the E-100 Series droids created by Dr. Eggman in 3236. Tasked with locating a frog that had absorbed Chaos' tail, E-104 brought back a random frog, as had two of the other robots. He along with E-101 Beta and E-103 Delta were transported away for their failure. After this, E-102 Gamma, who turned against Dr. Eggman, tracked down and destroyed E-104 Epsilon along with the other three E-100 series robots.

Trivia

 * In Sonic Adventure, E-104 Epsilon had two arm cannons like E-103 Delta after he was rebuilt, whereas in the comics he was only shown with one arm cannon.
 * Epsilon's name was never specified in the comics, though his number was present.