Sentinel R9-376 is one of the specially designed 'Domesticon' androids built to serve households across America. Built in Germany, the robot, unbeknownst to the public, is also equipped to serve the government as a walking camera for spying on citizens, and is also built to withstand extreme abuse. However, their simple AI has caused them to malfunction, carrying out their duties to alarming extent... including harming and killing humans.