The player starts the game as a window cleaner dressed in white overalls in the middle of cleaning the outside of a skyscraper.

The player then can enter the building through the now-open window and after examining a map with a missing flag-pin, he discovers a secret passage leading to a hidden room with strange machines in it.

The Council then explains history to the player: Humans had abandoned Earth and were living in colonies when the war with the Crughons erupted a century ago.

However, the Crughons managed to visit Earth in different periods of the past and plant three time bombs in the location of the future three S.D.I.

After an arcade sequence and the wounding of Lo'Ann, the player boards their spacecraft and travels to their headquarters to detonate the bomb prematurely.

The game ends when after successfully detonating the bomb long before hominids even evolve (and providing an alternate explanation for the Cretaceous–Paleogene extinction event), the player returns to the 44th century to fight further battles against the Crughons.

It also criticized the Cinematique engine as "not quite the innovation Future War's designers claim it to be—similar features have appeared in games by Sierra as well as Lucasfilm.