Watchdrones are Luminoth mechanoids that were found on Dark Aether. They are three-legged spheres that do not serve any combat functions, but are blocking the way to a Flying Ing Cache in Dark Torvus Bog. They only appear in Metroid Prime 2: Echoes.The Luminoth created the Watchdrones to guard important locations, however they were corrupted by the Ing, turning them against their former masters. They proved to serve a similar purpose to Ingworms, blocking access to areas. The Ing may have used them as a more "portable" blocking mechanism, for use guarding small tunnels rather than passageways and Doors.
Watchdrones are virtually indestructible, and as such are invunerable to all of Samus' weapons. They have one weakness: they dislike the light of Light Beacons, and will move out of the way when light beacons above them are activated. Samus used this method to get around them when she was searching for the Sky Temple Keys.
When Dark Aether was destroyed, it is likely that all the Watchdrones went with it.
- Watchdrones are similar in appearance to the Crawltanks used by the Space Pirates in Metroid Prime 3: Corruption, although are vastly different in behaviour and durability.
- Watchdrones slightly resemble elephants.