Marvel Tales and Unusual Stories were two related American semi-professional science fiction magazines published in 1934 and 1935 by William L. Crawford. Crawford was a science fiction fan who believed that the pulp magazines of the time were too limited in what they would publish. In 1933, he distributed a flyer announcing Unusual Stories, and declaring that no taboos would prevent him from publishing worthwhile fiction. The flyer included a page from P. Schuyler Miller's "The Titan", which Miller had been unable to sell to the professional magazines because of its sexual content. A partial issue of Unusual Stories was distributed in early 1934, but Crawford then launched a new title, Marvel Tales, in May 1934. A total of five issues of Marvel Tales and three of Unusual Stories appeared over the next two years.

Pulp magazines were inexpensive fiction magazines that were published from 1896 until around 1955. The term "pulp" derives from the cheap wood pulp paper on which the magazines were printed. In contrast, magazines printed on higher-quality paper were called "glossies" or "slicks". The typical pulp magazine had 128 pages; it was 7 inches (18 cm) wide by 10 inches (25 cm) high, and 0.5 inches (1.3 cm) thick, with ragged, untrimmed edges. Pulps were the successors to the penny dreadfuls, dime novels, and short-fiction magazines of the 19th century.