Published Mar 1971 by Marvel.
The FF battle the Nega-Man (first appearance) and Janus in "The Monstrous Mystery of the Nega-Man!" Script by Stan Lee. Pencils by Jack Kirby, John Buscema, and John Romita. Inks by Joe Sinnott. Cover by John Buscema and John Verpoorten. In brazen fashion Janus overpowers Mr. Fantastic and storms into the Negative Zone! Why?!? Does Janus know what could be waiting for him in the antimatter universe? However Janus (appropriately named after the two-faced roman deity) is also the Nega-Man! And the power of the Negative Zone already courses through his veins! After reviewing their first skirmish with Janus, the FF prepare to charge into the Negative Zone themselves! But hold on, someone else is coming through the portal from the other side! Look out! It's Annihilus! Origin of Janus. Cameo appearance by Annihilus. (Note: This issue contains Jack Kirby's final art on the series.) 32 pages Cover price $0.15.