Didn’t the F. F. [sic] “Challenge from Beyond” turn out well, considering? Yours was by far the best installment insofar as originality and workmanship are concerned. You had the hardest section, too—having to explain all the unconnected ramblings of your predecessors. Several of the installments, including mine, were carelessly written and loosely phrased, but yours, as usual, was a miracle of exact wording. And wasn’t it interesting to see how the personality of each writer colored his installment.
—C. L. Moore to H. P. Lovecraft, 11 Dec 1935, Letters to C. L. Moore and Others 87
Catherine Lucille Moore was one of the most prominent female writers at Weird Tales during its heyday, a contemporary and correspondent to H. P. Lovecraft, Robert E. Howard, and others in “the circle,” who praised her fiction. Several of her stories have definite aspects reminiscent of the nascent Cthulhu Mythos: Moore’s “Shambleau” (Weird Tales Nov 1933) and Robert E. Howard’s “The Slithering Shadow” (WT Sep 1933) both feature tentacled aliens who carnally assault their victims; the strange angles and dimensions of the tunnel in the depths of Joiry Castle in “Black God’s Kiss” (WT Oct 1934) and “Black God’s Shadow” (WT Dec 1934) are reminiscent of Lovecraft’s non-Euclidean geometries. Moore was introduced to her future husband and writing-partner Henry Kuttner through Lovecraft, and Kuttner made his own contributions to the Mythos, such as the Book of Iod.
Moore never participated directly in the collaborative universe of H. P. Lovecraft, Robert E. Howard, Clark Ashton Smith, August Derleth, and others—made no addition to the library of eldritch titles, no strange god with an unspeakable name, there was no road from Joiry to Averoigne or Arkham, Hyboria or Hyperborea. Neither did Lovecraft or the others reference her fiction in their own works. This was not in itself exceptional—other writers in “the circle” chose not to participate, or participated only through collaboration, like E. Hoffmann Price, who together with Lovecraft wrote “Through the Gates of the Silver Key” (WT Jul 1934), but who by himself never wrote a Mythos story, nor had any of his works referenced by his contemporaries in their Mythos stories. Moore was much the same; a colleague but not a co-conspirator… except for in one thing.
“The Challenge from Beyond” was the brainchild of Julius Schwartz, the teenage editor of the Fantasy Magazine; for the third anniversary issue of the fanzine, he had cooked up the idea of two round-robins, both titled “The Challenge from Beyond,” one being weird fiction and the other being science fiction. Schwartz successfully managed, after some effort and shake-ups, to attract a solid line-up for both; for the weird, C. L. Moore, A. Merritt, H. P. Lovecraft, Robert E. Howard, and Frank Belknap Long each wrote a section, building on each other’s efforts. Moore started it off.
Julius Schwartz has inveigled me into one of these chain-story things in which you are also scheduled to be drawn. I wrote a first installment and mailed it to him on the 18th. Certainly not a brilliant thing by any means—it’s hard to get very brilliant in three pages, especially if they’re chiefly devoted to setting the stage—but the best I could think of just then If it comes to you next, as I think it will, perhaps you can do better on the second installment. If you want to be bothered.
—C. L. Moore to H. P. Lovecraft, 22 Jul 1935, Letters to C. L. Moore and Others 53I hope you haven’t had too much trouble over your installment. Mr. Schwartz asked me to be as weird and original as possible in starting it out, and I was notably neither. At least there was a vast expanse of room for improvement as the story advanced. Frankly, if I’d been able to think up something strikingly weird and new I wouldn’t have given the idea away for nothing. Anyhow, it will be interesting to see what the others have done with such a poor start.
—C. L. Moore to H. P. Lovecraft, 22 Jul 1935, Letters to C. L. Moore and Others 62
Self-effacing to a fault, Moore’s section of “The Challenge from Beyond” is, despite her mea culpas, perfectly competent. True, not much happens and there is no mention of fantastic monsters, evil sorcery, lost races, or aliens from another planet or dimension—but it manages to hint of otherness, and establishes tone, character, setting, and subject, staying true to the basic premise while providing an obvious hook for the next writer. For 857 unpaid words, that’s not bad—and while dwarfed by Lovecraft (2,542) and Howard’s (1,037) sections, it is the third-longest section overall.
But is it a contribution to the Cthulhu Mythos?
And yet—that writing. Man-made, surely, although its characters were unfamiliar save in their faint hinting at cuneiform shapes. Or could there, in a Paleozoic world, have been things with a written language who might have graven these cryptic wedges upon the quartz-enveloped disc he held? Or—might a thing like this have fallen meteor-like out of space into the unformed rock of a still molten world? Could it—
—C. L. Moore, “The Challenge from Beyond”
Moore’s section was followed by a rather generic entry by A. Merritt—and it was up to Lovecraft to tie together the elements from their respective sections and actually begin to weave a story out of the thing. In Lovecraft’s section, Moore’s queerly-marked cube becomes an alien artifact, mentioned in the Eltdown Shards—a Mythos tome created by his correspondent Richard F. Searight. This is essentially the single element that ties “The Challenge from Beyond” into the larger collaborative universe that Lovecraft and his contemporaries were creating.
Reaction to the story in the letters of Lovecraft et al. is fair, with most of the focus on the interplay between Lovecraft and Howard’s sections—Lovecraft swapping the mind of Moore’s geologist with that of a sentient extraterrestrial worm on a distant world, and Howard deciding that said geologist rather liked being an alien worm and developing a desire to conquer this new planet—but this amusing juxtaposition of style could never have taken place without Moore’s initial contribution.
Debating C. L. Moore’s place as one of the early contributors to the Cthulhu Mythos is a strange hair to try and split, though I have done it myself in discussing “I Had Vacantly Crumpled It into My Pocket … But By God, Eliot, It Was a Photograph from Life!” (1964) by Joanna Russ. Moore wrote an idea, Lovecraft picked it up and ran with it, and any ties to the Mythos are through Lovecraft’s efforts. This was typical: Lovecraft’s previous collaborations with Anna Helen Croft, Winifred Virginia Jackson, his wife Sonia H. Greene, Clifford M. Eddy Jr., E. Hoffmann Price, R. H. Barlow, etc. had involved him expanding on the ideas of others, while adding his own. The difference here is that we know exactly where Moore’s prose ends and Lovecraft’s begins, because of the nature of the round-robin; in general collaborations, Lovecraft had a tendency to re-write much of the prose himself, muddying the issue of exactly how much each writer contributed in terms of pure wordcount and conception.
Whether or not you agree that Moore should be counted amid the co-creators of the Cthulhu Mythos, she was one of the peers in the circle of Weird Tales pulpsters and her contribution should not be neglected.
“The Challenge from Beyond” was first published in the Fantasy Magazine Sep 1935; it has been republished and recollected numerous times since then. It is out of copyright and may be read for free online.
Bobby Derie is the author of Sex and the Cthulhu Mythos
Deep Cuts in a Lovecraftian Vein 
Perhaps not Lovecraftian, her stories with her husband, Henry Kuttner, are brilliant. Read “Mimsy Were the Borogroves” and tell me you are not affected.
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