Worlds Unknown ran eight issues, cover-dated May 1973 to August 1974. The title was one of four launched by Marvel Comics editor-in-chief Roy Thomas to form a line of science fiction and horror anthologies with more thematic cohesiveness than the company’s earlier attempts that decade, which had included such series as Chamber of Darkness and Tower of Shadows. Whereas those titles generally presented original stories, these new books would instead adapt genre classics and other works.
EHT Comics 