The early 1950s saw dramatic changes in the world of U.S. science fiction (sf) publishing. At the start of 1949, all but one of the major magazines in the field were in
pulp format; by the end of 1955, almost all sf magazines had either ceased publication or switched to
digest format. This change was largely the work of the distributors, such as
American News Company, who refused to carry the pulp magazines since they were no longer profitable; the loss of profitability was in turn associated with the rise in mass-market science fiction publishing, with paperback publishers such as
Ace Books and
Ballantine Books becoming established. Along with the increase in science fiction in book form came a flood of new U.S. magazines: from a low of eight active magazines in 1946, the field expanded to twenty in 1950, and a further twenty-two had commenced publication by 1954.
Fantastic Universe was launched in the midst of this publishing boom. The publisher was King-Size Publications, founded by Leo Margulies and H. L. Herbert. Margulies had been in the pulp industry since 1932, having worked for
Frank Munsey and then for Beacon Magazines, where he had had overall responsibility for all their titles, including several sf pulps such as
Startling Stories and
Thrilling Wonder Stories. The first issue of
Fantastic Universe was in digest format, dated June–July 1953, and priced at 50 cents. This was higher than any of the competing magazines, but it also had the highest page count in the field at the time, with 192 pages. The initial editorial team was
Leo Margulies as publisher, and
Sam Merwin as editor; this was a combination familiar to science fiction fans from their years together at
Thrilling Wonder Stories, which Merwin had edited from 1945 to 1951. King-Size Publications also produced
The Saint Detective Magazine, which was popular, so
Fantastic Universe enjoyed good distribution from the start—a key factor in a magazine's success. Merwin left after three issues, and after a brief period in which Beatrice Jones was editor, Margulies took over as editor with the May 1954 issue. telling a friend that in addition to the debt there were personality conflicts and that the company couldn't generate enough income for two investors. The editorship passed to
Hans Stefan Santesson with the September 1956 issue. Circulation figures for
Fantastic Universe are unknown, since at that time circulation figures were not required to be published annually, as they were later. After the magazine folded, the publisher entertained plans to publish material bought for the magazine as a one-shot issue to be titled "Summer SF", but the issue never appeared. ==Contents and reception==