Marvel Two-in-One (1974) #19
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Characters
The radiation that mutated Reed Richards, Sue Storm and Johnny Storm into superhuman beings had also mutated Ben Grimm, transforming him into a grotesque, rock-hided strongman dubbed the Thing.
Although she was able to use the cat's-head amulet to change back to her human form, Greer Nelson became so accustomed to and enamored of her feline form that she seldom made the transformation.