The Fantastic Four move into their new home - Castle Doom - just as the real Dr. Doom returns! As the FF travel to Latveria, things couldn't be more topsy-turvy, but could all the chaos be caused by one of their own? What is the horrible secret kept by the Invisible Woman? And did we mention that the real Dr. Doom is back?!
— Description from Comic Vine community (comicvine.gamespot.com).
