When Barry Allen wakes at his desk, he discovers the world has changed. 가족은 살아있고, 사랑하는 사람들은 낯선 사람이 되었으며, 친한 친구들은 달라졌거나 사라졌거나 더 나빠졌어요. Its a world on the brink of a cataclysmic war but where are Earths Greatest Heroes to stop it?