Earth's Mightiest Heroes have assembled to face world-class threats whenever and wherever they might appear. They are the Avengers. Yet some threats transcend the ages. Centuries ago, a never-before-seen group of heroes gathered as the Avengers of their ancient era to fight the Zodiac, foes who wielded unimaginable arcane energies channeled through a mysterious Key. The resulting battle devastated vast swaths of the planet. The Key was lost and the Zodiac went into hiding, influencing world events from the shadows, waiting for the stars to align to usher in their return.

"An original novel"--cover. The official prequel to the video game Marvel's Avengers.