In a secret mountaintop complex, military researchers have discovered a portal linking Earth to an immeasurably distant world, rich with materials critical to America's theoretical weapons program. A shadowy government agency scours the Special Operations community, assembling the most elite and secretive team in the history of warfare to explore the alien world and bring back its secrets.

When a reconnaissance operation devolves into an all-out war against a host of terrors long faded to legend, a ragtag band of survivors uncovers a conspiracy stretching from the corridors of power in D.C. to the farthest reaches of the galaxy.

Hunted by their former comrades, and facing an inhuman army hell-bent on stopping any incursion, the survivors realize the fight they've chosen has only just begun . . . and is far larger than they could have imagined.