IS was a science fiction fanzine edited and published by Tom Collins.
Is was published in Austin, Texas, U.S.A. in the early 1970s. Six issues of IS appeared before the fanzine was renamed Apollo.
Issue 3 was released in July 1971, and featured the article "Tiptoeing Through Tulane" by Grant Carrington.
Issue 4, from October 1971, was the special August Derluth Memorial Issue and featured contributions of writing from William Blackbeard ("August Derluth and the Comics"), Robert Bloch, Ray Bradbury, Larry Niven, and Graham Wilson. Art work was contributed by Kelly Freas, and Tom Kirk, among others.
Issue 5, from 1972, featured the article "The Language of Science Fiction: Samuel R. Delaney discussed Roger Zelazny, Joanna Russ and Thomas Disch at Wesleyan University", and "Intrglossia to 'The Devil Is Dead'" by R.A. Lafferty.
Issue 6 was also published in 1972 featuring front cover art work by Cortén, interior art work by Stephen Fabian and Tim Kirk, and the articles "Liftoff" by Poul Anderson, "The Dalton Effect" by Isaac Asimov, "Letters to Derluth" by Robert E. Howard, and "Lovecraft and the Stars" by E. Hoffman Price.
Issue 7, as Apollo, was released in 1975 and featured illustrations by Cortén.
Tom Collins later published the fanzine Transient.