The Enforcement Droid Series 209, or ED-209 (pronounced Ed Two Oh Nine), is a fictional heavily armed robot that appears in the RoboCop franchise.

It serves as a foil for RoboCop, as well as a source of comic relief due to its lack of intelligence and tendency towards clumsy malfunctions.

In Marvel's 1990 RoboCop comic, OCP Vice President Donald Johnson orders the creation of the ED-309.

[5] Verhoeven wanted ED-209 to look mean and believed Davies' early designs lacked a "killer" aesthetic.

Davies was influenced by killer whales and a United States Air Force Corsair Jet.

The finished model took four months to build at a cost of $25,000, stood 7 ft (2.1 m) tall, and weighed 300 to 500 lb (140 to 230 kg).

[7][8][9] The 100-hour working weeks took their toll, and Davies decided to make ED-209's feet minimal in detail as he did not think they would be shown on camera.

[12][8][9] Davies spent a further four months to build two 12 in (30 cm) miniature replicas that were made as light as possible so that the armature need not be bulky.

[16] A blur was added to make the movement appear more natural by gently shaking the model or set as needed.