You are the last remaining survivor of a mysterious accident in a top-secret lab complex. The virus you are carrying is spreading through the air and you are the only one who is not infected.

In the lab, you find an artificial intelligence that is communicating with you. The artificial intelligence gives you a number of choices and you have to make the right decisions to survive.

Your decisions affect the course of the story, and the outcome of the survival.

Symbiont 1 is a science fiction survival game, in which the entire world is a hostile environment, where the dead are walking.