Year 2050, the army of the United States of America is developing an ultra secret plan in subterranean military installations to swap the units of the land infantry by autonomous robots.

The plan is in an advanced phase and they have a functional prototype that are perfectioning for it's final phase.

In one of the routine updates of the software of one of the most old units of the programme, such unity recibe a corrupt update and is bestowed with an Artificial Intelligence far more superior than the other units of the programme. Because of it's superiority, the rest of the available units in the installations receive the order of destroying the "broken" unit. Because of the imminent danger, the only option of "84D4S" is to flee.