Unknown Worlds of Science Fiction Special #1

After mediocre sales forced the cancellation of Marvel's UNKNOWN WORLDS OF SCIENCE FICTION, they collected some of the finished stories that would have gone into subsequent issues, and published a one-shot special to test the waters, determining if the readership would more readily support a less-frequently published, but bigger, black-and-white SF comic magazine.  The result was 'no', and no further issues were produced.