Fantastic Four #51
In "This Man... This Monster!", the Fantastic Four face a chilling deception when an unnamed scientist, transformed to resemble the Thing, infiltrates the Baxter Building with murderous intent—only for a twist of fate to turn his plan into a desperate act of heroism. Written by Stan Lee and Jack Kirby, with art by Jack Kirby and inks by Joe Sinnott, this pivotal 1966 issue delivers a shocking revelation that upends the team’s trust and sends Reed Richards into the Negative Zone. The cover by Jack Kirby and Joe Sinnott captures the tension perfectly, setting the stage for one of the series’ most enduring mysteries.
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An unnamed scientist gives himself the powers and appearance of the Thing and goes to the Baxter Building, planning to kill Reed. However, an accident results in him saving Reed's life and perishing in the Negative Zone.
Plot details indexed by the Grand Comics Database (CC BY-SA).