The reactor system is the heart of the doomsday device, generating the energy needed to power the entire operation. It's a complex system of nuclear reactors, each one more unstable than the last.
This system is responsible for delivering the power generated by the reactor system to the rest of the device. It's a network of high-voltage lines, transformers, and relays.
This system is responsible for monitoring and controlling the entire doomsday device. It's a complex system of sensors, computers, and control panels.