Though it may look like it...
...this is not the pencil work of Jack (King) Kirby!
The GCD says the inking for this story from Fox's Fantastic Comics #10 (1940) is by Kirby!
I believe the penciling is his partner, Joe Simon, reworking Kirby's opening panel from Fox's Science Comics #4 for the new opener...
...and then writing/penciling the rest of the story!
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Science Fiction Comics
Taylor History of Comics
Vol 3