The Fantastic Four continue their explorations into the impossible - when they confront none other than the Impossible Man who will both torment and team-up in an attempt to make the team a Fantastic Five! Then, Reed Richards is replaced by his evil Counter-Earth counterpart. It's a saga so epic in scope that Thundra, Tigra, the Mad Thinker and Annihilus are pulled into it... as Reed battles for his life in the heart of the Negative Zone! Collecting: Fantastic Four (1961) 176-191