A planet covered entirely by water, with no land masses above the surface and traces of encrypted technology, according to the eShip's computer. Hydrox was the setting for Season 6.
The following places were located on Hydrox:
- The Research Facility
- Prison Cells
- The Sea Court
- The Subterranean Hydroxian Temple
- The Underwater Sea Aqua College
The planet was completely annihilated in The Day The World Did Stuff, along with most of the SeaPeople, Mr. Malice, and whatever remained of the eShip.
Its name comes from an old brand of Oreo-type cookies.