Cover pencils and inks credits confirmed from Julius Schwartz's editorial records, provided by DC Comics (19 August 2007); the original indexer credited the pencils to Alex Saviuk and the inks to Frank Giacoia.
The dedication for the story reads, "Dedicated to Wayne Boring and the (unknown) creator of the Thing." (The story is a sequel to one from 1954 in which the Thing originally appeared; for most of this story, he is believed to be Superman.)
Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics.