Behind this kool, never-reprinted Jack Kirby/Christopher Rule cover...
...lurks an equally-cool (but visually-different) never-reprinted tale!
Plotted by Stan Lee, scripted by Larry Lieber, and penciled/inked by Joe Sinnott, this cover-featured tale from Atlas' World of Fantasy #18 (1959) was a combination of the "giant monster with weird name" and Twilight Zone "switch ending" tropes Lee was so fond of.
You'll note the "monster" is rendered pretty much the same on both the cover and insides, while the Earthmen and aliens are vastly-different!
I'm not certain which was done first, but the difference between the Flash Gordon/Buck Rogers renderings by Sinnott and the...well...Kirbyesque versions on the cover are striking!