Designed to compete with DC Comics' successful launches of "House of Mystery" and "House of Secrets", "Tower of Shadows", like its companion comic "Chamber of Darkness", sold poorly despite the roster of artists featured. After its first few issues, the title, published bimonthly, began including reprints of "pre-superhero Marvel" monster stories and other SF/fantasy tales from Marvel's 1950s and early 1960s predecessor, Atlas Comics. After the ninth issue, the title changed to "Creatures on the Loose", and the comic became a mix of reprints and occasional sword and sorcery/SF series.