RK Units are robots featured in Netflix's He-Man and the Masters of the Universe. They are levitating security robots that provide the bulk of for the royal military of Eternos. Each RK unit has a number and designation, typically denoted by RK followed by their factory number. As all RK units respond to a computer hivemind in order to work as an organized security force, the RK units can be reprogrammed to turn against their superiors if this control system is overridden by foreign influence.
RK-0 was once among their numbers, until a malfunction-reboot caused him to gain free will and identity as Ork-0.