Two years ago, on the first of the year 2019, the Ethereal forces attempting to subjugate Earth surrendered to X-COM forces, after their leader and Commander was killed. This Story of Defiance is one that will be told many times throughout the ages as the time humanity finally banded together to defeat a common foe, marking their entrance onto the galactic scene. But that story is better told elsewhere. During the events of what has come to be called the Ethereal Subjugation War, a man named Isaac Anderson came out of hiding to assist X-COM under the moniker of Overseer. What was he hiding from? A person who had been haunting his life for the past couple of decades. A person who had, in an effort to break him, killed his wife Helen and attempted to brainwash his daughter Penny. A person called Matthew Lester. And Isaac wants revenge. Now, after world events have calmed down, the time is ripe. The time has come to move to a war footing. Lester's own judgement day is nigh.