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E-105 Zeta (Ｅ－１０５ "ゼータ",E-105 Zeta?), or E105ζ, is an E-Series robot constructed to serve on board the Egg Carrier. Initially he is a re-colored clone of E-102 Gamma, but later goes through severe alteration and reconstruction to a considerably larger stationary defense unit built in the engine room of the Egg Carrier.
E-105 Zeta was banished from the Egg Carrier crew, along with Delta and Epsilon, by Dr. Eggman for retrieving the wrong frog when he was searching for Froggy. However, like 'brother' E-101 Beta, Zeta stays aboard the Egg Carrier and undergoes extreme surgery and reconstruction. He emerges as a much larger advanced defense unit, no longer mobile but with seven rocket turrets around his perimeter. E-102 Gamma still manages to destroy him however and releases the Flicky inside.
To defeat E-105 Zeta, to take out all the large turrets surrounding the robot. Don't get fancy with this battle. Run around the rink and flash your targeting laser toward the robot when you can. When E-105 launches a volley of missiles, keep moving to lure them off course, or target and destroy them. Each time you blow off a turret, E-105's energy level drops. When the turrets are all gone, so is E-105.
In Sonic X, E-101 Beta replaced much of Zeta's role, so much that in fact, Zeta only appears in "Revenge of the Robot". This is when Gamma comes to the Hot Shelter to destroy him. However, he just inserts a deactivation code through a cable cord in the show.
The lower half of Zeta's frame is built out of Sega Dreamcasts, inserted by Sonic Team as an Easter Egg. This is present in all versions of Sonic Adventure.
Zeta is one of two E-series robots in Sonic Adventure to receive a physical upgrade and change in appearance (the other being Beta). The remaining E-Series robots, including Gamma, only received enhanced Arm Cannons.