->''[[CrushKillDestroy "Crush! Kill! Destroy!"]]''
->-- The Robot from ''LostInSpace''

->''"So two robots walk into an eating establishment... and destroy all humans!"''
->-- Robot Stand-Up Comedian, ''FairlyOddParents''

->''"No, HK-47, you are not to throw grenades at or near civilians."''
->-- The Jedi Exile, ''KnightsOfTheOldRepublic II: [[ElectricBoogaloo The Sith Lords]]''

A robot or other physically autonomous machine guided by a [[AIIsACrapshoot level of intelligence]] and a homicidal urge to KillAllHumans. Prone to ending sentences with exclamation points as well as SpockSpeak. Killer Robots are so common because AIIsACrapshoot.

Humanoid killer robots abound, such as the original ''Rossum's Universal [[TropeNamer Robots]]'', or those in DoctorWho's subtly named serial "The Robots of Death". However, killing machines come in all shapes and sizes; from robotic dreadnoughts in space to airborne robo-fighters, through small drones and down to microscopic or even [[{{Nanomachines}} nanoscopic]] killers.

Although the traditional versions of this trope were robots built in a MadScientistLaboratory who TurnedAgainstTheirMasters, today a more common plot involves the villain finding and [[MoralityDial turning the switch]] on a kid's RobotBuddy from "good" to "evil", forcing the cast to look for a way to restore them. Especially [[NightmareFuel scary]] because this was a good friend who has become completely heartless and bent on death.

Subtropes:
* AIIsACrapshoot
* ArtificialHuman
* CrushKillDestroy
* CyberCyclops
* HumongousMecha
* {{Mecha-Mooks}}
* MoralityDial
* {{Nanomachines}}
* RobotGirl
* RobotWar
* EvilRobby
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