Iron Dominion Takeover

The Iron Dominion Takeover was an event that occurred on the planet Mobius on the year 3237 in the Sonic the Hedgehog comic series published by Archie Comics. Within these series of events, the Iron Dominion takes over the Eggman Empire thanks to Snively Robotnik right after Dr. Eggman lost to Sonic the Hedgehog during the Invasion of the Eggdome strike-out battle between the Knothole Freedom Fighters and the Chaotix against the Eggman Empire and Dark Egg Legion. The Iron Dominion then take over New Mobotropolis after a series of strike-outs against the Freedom Fighters, namely Sonic. This event has became the longest saga in the Sonic the Hedgehog comic series, being so long that an arc for the Sonic Universe comics was made to continue the story.

Prelude
The Eggman Empire was about to fall badly. Sonic had led the Freedom Fighters and the Chaotix to New Megaopolis inside the Eggdome to prepare a strike-out attack inside. Sonic had come across all odds and defeated Eggman's last resort, the Egg Tarantula. When Eggman had lost, the doctor went to the brick of insanity. Snively Robotnik had then told Sonic after defeating Eggman that he now has to deal with him. And thus, the Freedom Fighters had won. They assumed the Second Robotnik War was over and done with. Little did they realize that Snively had called reinforcements. He then introduced the Iron Queen, the Iron King, and their Iron Dominion to the Eggman Empire, taking over the entire empire behind Eggman's back... (StH #199, #200)

Warnings of an Invasion
In New Mobotropolis, the Forget Me Knots host a concert after Eggman's defeat, as they shall began a new life on Mobius until suddenly, lighting bolts alarm the Forget-Me-Knots' singer, Mina Mongoose. This was caused by Monkey Khan, who berates the citizens for not continuing the fight against the Eggman Empire. Sonic then jumps straight into the stage and fights against Khan. Sally Acorn then stops the fighting, and tells Khan that the war is done for. Khan, however, insists that the leader is down, but not the actual empire. Khan then explains that the Iron Dominion has taken over the empire and that the dominion have four clans–the Shinobi, the Raiju, the Yagyu, and the Gossamer clans–to back them up in case if the dominion falls. Elias Acorn, the king of New Mobotropolis, tells Antoine D'Coolette to gather up the Council Of Acorn members to suggest how to handle the situation. But, Khan yells at Elias, saying that they did that with Robotnik, but it has never worked in the first place. (StH #201)