"Not only is Jolly Jack Kirby the undisputed king of superhero artwork..."
"...from The Fantastic Four to long-haired Thor, but he is equally without peer in almost every type of imaginative, far-out fantasy!" --Stan Lee
This tale from Marvel's Fantasy Masterpieces #1 (1965) originally-appeared in Journey into Mystery #60 (1960), and was reprinted, again, in Where Monsters Dwell #9 (1971), but hasn't appeared anywhere in the last 44 years.
That's a pity, since this Jack Kirby-penciled/Steve Ditko-inked story predates both the Kirby-rendered "The Man in the Ant Hill" (Tales to Astonish #27) which introduced Henry Pym who would become...
...aw, you guessed...ANT-MAN...
(Wonder what ever became of him?)
...and Amazing Fantasy #15, featuring Steve Ditko's most famous co-creation...
..your friendly, neighborhood SPIDER-MAN!
BTW, has anyone ever noticed that Ant-Man's and Spider-Man's costumes have opposite/reversed red/blue color schemes?
As for who wrote this tale, the experts believe it's a Stan Lee-plotted, Larry Lieber-scripted story, but I think Lee scripted it as well.
Tomorrow: Another Silver Age artist struts his stuff in a long-unseen short!