In another reality, the Fantastic Four are known as the Challengers of Doom. They reside in a building similar to the Baxter Building, known as Latveria's Fall Plaza. 
 
The leader of the team is none other than Doctor Doom. Something terrible had happened to Latveria by the Russians according to Doom and the world was in a sort of Cold War. Beloved by all Americans, Doom and his challengers swear nothing like that will happen to the USA.
 
This Earth was destroyed by Galactus as Doom believed his threat to be a Russian trick and did not act.