1.5 Billion Years ago, an alien civilisation attempted a grand experiment with fatal consequences. In an attempt to protect other future civilisations, an advanced system of Sentinels were deployed and tasked with protecting young developing worlds.
For eons, unbeknown to its dominant specie, Earth counted amongst those protected worlds. Yet as human development progressed, knowledge of the existence of these Sentinels and the Guardians within its service could no longer be obscured.
Now, as knowledge of alien intervention becomes common knowledge, Earth and its extra-terrestrial protector faces their most threatening challenge to date.