Overdog

The Overdog is a (presumably) Chozo-built supercomputer featured in Blood of the Chozo. Its exact specifications are unclear, but it featuers a network of information compared to the modern Internet and apparently has advanced sensors and can predict the future to a limited extent. It seems to be the inspiration for the Aurora Units later introduced.

Apparently, one thousand years prior to the Metroid series, the Overdog had a "chosen race" of Chozo refered to as the Proto Chozo, who existed in a massive ancient city on Naiad.