In this RPG by Chuck "Chuckles" Bueche, players take the role of an ordinary guy who lives in the futuristic city of Metropolis. The city has been conquered, and its population enslaved by an alien race known as Tzorgs. They have sent robots to maintain order in Metropolis, turning it into a police state. There are rumours of an underground resistance movement somewhere, and those who wish to battle against the Tzorgs. But the path to find the resistance is dangerous, and being caught by the robots will lead to being thrown in prison...
The gameplay style is very similar to the Ultima series, also from Origin. The entire game is viewed from a top-down perspective. The various commands (search, open, talk, etc.) are executed by pressing the corresponding key on the keyboard. Battles take place on the same screen as exploration, and require the player to press A (for "attack") and a directional key to aim at the enemy. The game is set entirely in the big city, with streets and buildings to explore, items and weapons to buy, and people to talk to.
In addition to a large fold out city map, 2400 A.D. was packaged with a set of three lead figures. All three depict heavily armed robot soldiers and were cast by Grenadier Miniatures (two in 1984 and one in 1987).