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This location exists primarily or exclusively within the Pre-Super Genesis Wave continuity.
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For the Zone in Sonic the Hedgehog 3, see Hydrocity Zone.

Hydro City is a location that appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. It was an ancient and abandoned underground city filled with water located underground on Angel Island.


Despite its name, Hydro City looks more like a sewer than an ancient city.[2] According to Locke, Hydro City uses solar cells as a form of power.[3]


Constructed hundreds of years ago, Hydro City was supposedly constructed even before Echidnaopolis had been.[2]

In 3236, Knuckles the Echidna lead Monk to Hydro City to evade being captured by Hunter. Eventually, Knuckles managed to defeat the Overlander there, but not before Monk was killed.[2]



  1. Sonic the Hedgehog: The Complete Sonic Comic Encyclopedia, "Angel Island"
  2. 2.0 2.1 2.2 Knuckles the Echidna #32, "To the Death"
  3. Sonic the Hedgehog #116, "Ultimate Power Mid-logue: The Lesson"

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