thumb|Cover for the inaugural issue, which appeared in Summer 1950.

Science Fantasy, which also appeared under the titles Impulse and SF Impulse, was a British fantasy and science fiction magazine, launched in 1950 by Nova Publications as a companion to Nova's New Worlds. Walter Gillings was editor for the first two issues, and was then replaced by John Carnell, the editor of New Worlds, as a cost-saving measure. Carnell edited both magazines until Nova went out of business in early 1964. The titles were acquired by Roberts & Vinter, who hired Kyril Bonfiglioli to edit Science Fantasy; Bonfiglioli changed the title to Impulse in early 1966, but the new title led to confusion with the distributors and sales fell, though the magazine remained profitable. The title was changed again to SF Impulse for the last few issues. Science Fantasy ceased publication the following year, when Roberts & Vinter came under financial pressure after their printer went bankrupt.

Gillings had an inventory of material that he had acquired while editing Fantasy, and he drew on this for Science Fantasy, as well as incorporating his own fanzine, Science Fantasy Review, into the new magazine. Once Carnell took over, Science Fantasy typically ran a long lead novelette along with several shorter stories; prominent contributors in the 1950s included John Brunner, Ken Bulmer, and Brian Aldiss, whose first novel Nonstop appeared (in an early version) in the February 1956 issue. Fantasy stories began to appear more frequently during the latter half of the 1950s, and in the early 1960s Carnell began to publish Thomas Burnett Swann's well-received historical fantasies. Carnell felt that the literary quality of Science Fantasy was always higher than that of New Worlds, and in the early 1960s his efforts were rewarded with three consecutive Hugo nominations for best magazine. Under Bonfiglioli more new writers appeared, including Keith Roberts, Brian Stableford and Josephine Saxton. In the opinion of science fiction historian Mike Ashley, the final year of Impulse, as it was titled by that time, included some of the best material ever published in a British science fiction magazine.

Publication history

Gillings and Carnell

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! !! !!colspan="3"| Spring !!colspan="3"| Summer !!colspan="3"| Autumn!!colspan="2"| Winter

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! !!Jan !! Feb !!Mar !!Apr !!May !!Jun !!Jul !!Aug !!Sep !!Oct !!Nov !!Dec

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! 1950

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! 1951

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! 1952

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! 1953

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!1954

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!1955

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!1956

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!1957

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!1958

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!1959

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|colspan="13" style="font-size: 8pt; text-align:left"|Issues of Science Fantasy in the 1950s, showing volume/issue number, and<br />color-coded to show who was editor for each issue. Walter Gillings was the<br />editor for the first two issues; John Carnell took over for the remainder of the<br />1950s. Underlining indicates that the magazine was titled with the season (e.g.<br />"Summer 1950") for that issue. Issue 7 was only dated with the year, 1954.

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In early 1946, John Carnell launched a new science fiction magazine titled New Worlds, published by Pendulum Publications. The first issue appeared in July 1946 and failed to sell well. The second issue, that October, sold better, but Pendulum went out of business before the end of 1947 with only one more issue released. A group of sf fans, including Carnell and Frank Cooper, decided to restart the magazine under their own control, and formed Nova Publications Ltd. The fourth issue appeared in April 1949.

At the same time that the first issue of New Worlds appeared, a separate British magazine called Fantasy was launched by Walter Gillings, a science fiction fan and a reporter by profession. Fantasy lasted for only three issues before closing in 1947, but Gillings had accumulated a substantial inventory of stories—enough to fill nine issues. Gillings followed the demise of Fantasy by publishing a fanzine, titled Fantasy Review, beginning in March 1947.

In 1950, with New Worlds on a stable quarterly schedule, Nova Publications decided to launch a companion, Science Fantasy.

After the Spring 1953 issue, Nova Publications decided to switch printers, in order to cut costs and bring the cover price down from 2/- (10 p) to 1/6 (7.5 p). The new printers, The Carlton Press, failed to keep to the agreed printing schedule, and produced poor quality work; there were also printers' strikes, and this disruption caused extended delays in the appearance of the seventh issue.

In 1958, Nova decided to launch a British reprint of the American magazine Science Fiction Adventures, under the same title. The British Science Fiction Adventures lasted until May 1963, when it was felled by declining sales.