I doubt the writers and artists knew that AIRBOY #90 was fated to be the last issue of the ten-year-old survivor of the WWII superhero boom. Still, the final HEAP story does provide a better-than-average wrap-up for the wandering muck-monster. Various earlier stories had attempted to infuse the horror-themed creature with a dollop of high fantasy, like linking the Heap to Demeter, Goddess of the Harvest. But though I have not read the entire run of the Golden Age Heap, I doubt any other stories did better than CAVE OF THE BANSHEES in terms of mythicity.
The previous HEAP story had "nature's powerful messenger of right" (see above caption) in Germany, the native land of the late air ace who became transformed into a swamp-creature. Neither artist Ernie Schroeder nor the unbilled writer provide the least rationale as to why the near-mindless monster winds up on the Irish seacoast, watching as a young woman is apparently being carried away to some dire fate. The splash alone suggested to me the Irish idea of the mythical Pookah:
If a human is enticed onto a pĂșca's back, it has been known to give them a wild ride; however, unlike a kelpie, which will take its rider and dive into the nearest stream or lake to drown and devour them, the pĂșca will do its rider no real harm
Following the splash, the story juxtaposes rich Irish against poor Irish, and both in terms of beautiful women: the Countess, who owns and races horses, and Moira Shea, who's been made poor by her uncle making bad bets on horse-races. The two women don't speak but each sees the other in negative terms: Moira as a "witch," the Countess as "something evil."
Moira at least has a specific reason to fear the foreign woman's presence, for her boyfriend Tim seems smitten with the Countess. However, the same uncle who ruined their family financially has one prize for Moira's dowry: the untamed white stallion Killarney King. Motivated less by money than by the desire to show up the Countess, Moira tames the King.
However, the Heap stumbles across Moira taking the King out for a canter, and the horse panics, plunging into a nearby bog. But bogs are no challenge to the superhuman swamp monster, who carries stallion and rider to safety.
Possibly the Heap has his own "heap-o-trouble" sense, for on the same day, he meanders over to the estate of the Countess. A jealous trainer almost gets Tim killed by provoking the black stallion "Satan," but the Heap saves Tim. From Moira's POV, this is doubly good because the Countess believes the trainer's lies and sacks Tim, thus getting Tim away from the Countess' beauty.
To be sure, the Countess never shows any romantic interest in Tim. However, when the noblewoman gets a look at Killarney King racing along the meadows, she covets the stallion, realizing that the King is faster than Satan, her best horse. She doesn't exactly tell her corrupt trainer to set up a booby trap for the horse, but the guy does so anyway. (This also seems counter-intuitive, since a trap might injure the horse, so probably the writer just introduced the gimmick to set up the trainer's death.) In any case, the Countess makes a bet with Moira. When Moira can't pay the entry fee, the Countess pays it, against the promise that Moira will surrender the King if the King loses the race. Up to this point, the rich beauty hasn't done anything villainous-- but then she cheats during the race, setting her, not Moira, up for the dire fate seen in the splash panel.
So we're at the last page, meaning that the writer has scant time to show us what he meant by the "cave of the banshees," mentioned only in the opening caption-- and then, that's even after getting rid of the trainer by having him trampled to death by the very steed he tormented earlier. Fortunately, even in 1950s America, the association of the banshees with death-spirits was pretty solid (even before the DARBY O'GILL film). Satan the stallion, panicked by the trap, serves the function of a pookah, plunging with his rider into the legendary cave-- and only the Heap bears witness when the "haggard broken horse" emerges from the cave without his rider.

































