Fantastic Four (1961 1st Series) #51
1st Printing. Cover pencils by Jack Kirby, inks by Joe Sinnott. This Man... This Monster!, script by Stan Lee, pencils by Jack Kirby, inks by Joe Sinnott;
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.
36 pgs. $0.12.