M-4

See M-4 multitronic unit for the failed computer unit by this same name.

M-4 was the designation for a robot constructed by Flint. It served as his "butler, housekeeper, gardener, and guardian." The robot hovered in the air and was capable of firing a type of heat beam.

It was destroyed when Spock fired a type 2 phaser at it in 2269, and was immediately replaced by a second unit: "Too useful a device to be without, really". (TOS: "Requiem for Methuselah")