The Eggman Empire Fortress is a location that appears in the Sonic the Hedgehog comic series and its spin-offs published by IDW Publishing. It is a colossal fortification on Sonic's world that served as the Eggman Empire's military headquarters.
The Eggman Empire Fortress is a high-tech fortification with spotlights located in the middle of a deep crater whose edges are surrounded by high walls. These walls extend into the depths of the crater, forming staircase-like levels. Rising up from the center of the crater is a massive high-tech tower with tall metallic pieces forming hoops circling around it. The fortress also has several floating platforms.
In the recent past, the Eggman Empire Fortress served as a major location belonging to the Eggman Empire during the war between the Eggman Empire and the Resistance. Eventually, the Eggman Empire fortress became the site where Sonic the Hedgehog and the Resistance defeated Dr. Eggman and broke the Eggman Empire's control over their world. This ended in a confrontation between Sonic and Eggman, the latter piloting his latest Death Egg Robot in the fortress itself. In the end, Sonic was victorious, and the mad genius was defeated.
- The Eggman Empire Fortress is based on the location of the same name from the Sonic the Hedgehog video games that first appeared in Sonic Forces.