"The Monstrous Mystery of the Nega-Man!"
In a strange tale, the back-story of Janus is explained. Janus experimented with Negative energy and creates an alter-ego of himself, an evil twin called the Nega-Man. The Nega-Man goes out to rule the world and is only defeated when Janus shoots his evil alter-ego. Janus' obsession does not end there. He craves more power and that is when he seeks out Reed and access to the Negative Zone. While in the Negative Zone, Janus allows Annihilus to find the gateway back to the Baxter Building as one of the most powerful and diabolical enemies is about to come to Earth.
Final Jack Kirby issue.