Drones, Workers, Hunters and Guards would have been enemies encountered on the large spaceship that was the setting of the proposed Metroid 1.5, elements of which later became Metroid Prime 2: Echoes. Drones were simple patrol robots that could call for fellow robot backup if an enemy appeared, and were usually cloaked, similar to the Cloaked Drone. Workers were slow and heavy industrial bots with tread-based movement that used flame throwers, jack hammers and drills for both work and weapons; these may have evolved into the robots seen in the Echoes Sanctuary Fortress. Hunters were bipedal androids that could traverse walls and use an electro-blade, described as IG-88 (from Star Wars) "hopped up on too much caffeine with a really angry disposition". The Hunters may also have inspired the