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Auto-Fiona, the most well-known Auto-Automaton.

The Auto Automatons were designed to be perfect robotic replicas of s Mobians, originally created by Dr. Ivo Robotnik. Auto Automatons were designed to infiltrate various Freedom Fighter groups and gather information. Dr. Eggman later improved upon the design, creating the Infiltrators.


Auto Automatons

The first functioning Auto Automaton model was based off Sally Acorn and was used to deceive Royal Underground member Geoffrey St. John. The Auto Automaton of Sally was discovered to be a robot however and destroyed with help from Sally's Trainees. The factory which was mass producing Auto Automatons was also destroyed despite being guarded by a contingent of Stealth Bots. (PSM: #1, #2, #3)

Another of the few surviving Auto Automatons, based off of Fiona Fox, was used to deceive Tails during one of his early solo adventures. Tails fell in love with the replica Fiona, and was heart broken when he discovered it to be a robot. However, Tails still wouldn't fight the Auto Automaton, and only survived because they fell into the water where the robot rusted. Tails left the robot on the island, and never saw the robot shed tears at Tails leaving after Robotnik. (StH: #28, #29)

While the Freedom Fighters left Knothole to obtain the Sword of Acorns, which had been obtained by Knuckles the Echidna, King Max was captured and replaced with an Auto Automaton of himself, which deceived everyone until Robotnik exposed it to be a fake after invading Knothole. (StH: #47, #48, #49, SSS: #1)

When Mighty the Armadillo, Nic the Weasel and the real Fiona Fox returned to one of Robotnik's forced labour camps (where Mighty, Fiona and Ray the Squirrel had been held captive as children), they found old, unused Auto Automatons based on the Freedom Fighters. (KtE: #29)


Years later, Dr. Eggman created similar robots, instead calling them Infiltrators. An Auto Automaton/Infiltrator of Tommy Turtle was created and nearly killed Sonic after badly damaging Sonic's father. After this Auto Automaton's destruction, Sonic and the Freedom Fighters went to New Megaopolis where they found thousands of Auto Automatons being mass produced. The factory was subsequently destroyed-following a battle with Infiltrators based on Sonic and Sally-and the real Tommy was rescued. (StH: #135, #136, #137)

Some time later, Eggman tried again, this time using Renfield T. Rodent's Casinopolis in Station Square. The casino had scanners in slot machines that would copy individual data, which would then be used to make infiltrators to replace the originals. The Chaotix were chosen by the President to investigate as they'd had previous experience with Renfield. Renfield managed to use an Infiltrator copy of a Mobian horse to capture Knuckles, and ensnared Vector the Crocodile, Espio the Chameleon, and Rouge the Bat with a scanner disguised as a slot machine. Despite being discovered, Renfield gloated that the amount of data already collected would let him build a small army. However, Julie-Su unplugged the computer, destroying the transfered data and preventing it from being used, and Mighty the Armadillo destroyed the factory, saying no one could use an army of robots that hadn't been created yet. Renfield was subsequently arrested and tried in Station Square courts. (StH: #166)

Snively later resurrected the Infiltrator models to act as decoys in his escape from the Death Egg Mark 2. Eggman would also use one of these models to trick the Iron Queen into thinking that Snively was loyally by her side when she was given control of Hugo Brass's Dark Egg Legion chapter. (SU: #37, SU: #40)


The Auto Automatons were skillful duplications of the Mobians they were created to look like, but had a number of weaknesses. The greatest of these was lack of resistance to water: Auto-Fiona rusted after briefly being exposed to ocean water. Despite this, the Automatons were possessed of combat abilities, including greater than average Mobian strength.

The Infiltrator models were greatly improved, and were even equipped with weapons systems. Though more powerful, they were also limited by the need for programming based on scans of the minds of the beings they were based on. As a result, they were much more difficult to utilize.

Known Templates

Background Information

  • Auto Automatons have sometimes been called Auto Automations.
  • There are several questions about Auto Automatons regarding liquids. Fiona Fox's Auto Automaton rusted because of water, yet she was also shown drinking some sort of liquid and a tear came out of her eye when Tails left her. (StH: #29)
  • An automaton is a self-operating machine that is often used to describe a robot.
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