A majority of the stories in "Fantastic Adventures" came from a small group of writers who often wrote under house names. The main members of the group were William P. McGivern, David Wright O'Brien, Don Wilcox, Chester S. Geier, Rog Phillips, Leroy Yerxa, Robert Moore Williams, Robert Bloch and Berkeley Livingston. Most of this material was of little lasting value, in Ashley's opinion, but Palmer was often able to get good stories from outside this group: August Derleth sold several stories to Palmer, for example. Ray Bradbury also sold a story to "Fantastic Adventures"—"Tomorrow and Tomorrow", which appeared in 1947, was his only appearance in the magazine, but Ashley regards it as "among the best stories ["Fantastic Adventures"] published in the 1940s". An early contributor was Nelson S. Bond, whose story "The Judging of the Priestess" appeared in the April 1940 issue. This was the second in a highly regarded series of three stories about a priestess in the future, after civilization has collapsed; the first and third in the series appeared in "Amazing Stories" and "Astounding Stories" respectively. Bond also wrote a humorous short story called "The Amazing Invention of Wilberforce Weems", which appeared in the September 1939 issue and described the consequences of a potion that allowed the instant absorption of knowledge from any book. Palmer encouraged his stable of writers to follow up with more whimsical ideas, and the resulting offbeat stories gave "Fantastic Adventures" a reputation for light-hearted and entertaining fantasy. These stories often had absurd names; early examples include "The Quandary of Quantus Quaggle", "Sidney, the Screwloose Robot" (both by McGivern), and "The Weird Doom of Floyd Scrilch", by Robert Bloch—one of his series of stories about Lefty Feep, almost all of which appeared in "Fantastic Adventures" between 1942 and 1945. Robert Moore Williams contributed two sequels to his successful "Jongor of Lost Land": "The Return of Jongor" appeared in 1944, and "Jongor Fights Back" in 1951.