 By 1957 the boom had reached its height; 24 science fiction magazines published at least one issue that year.One of the most prominent of these magazines, "Galaxy Science Fiction", had a successful association with two radio shows, "Dimension X" and "X Minus One".This sparked imitators, and during 1956 Lyle Kenyon Engel of Republic Features Syndicate put together a package of two radio shows and four magazines.