Precursors to horror comics include detective and crime comics that incorporated horror motifs into their graphics, and early superhero stories that sometimes included the likes of ghouls and vampires. Individual horror stories appeared as early as 1940. The first dedicated horror comic books appear to be Gilberton Publications' Classic Comics #13 (Aug. 1943), with its full-length adaptation of Robert Louis Stevenson's Strange Case of Dr Jekyll and Mr Hyde, and Avon Publications' anthology Eerie Comics #1 (Jan. 1947), the first horror comic with original content. The first horror-comics series is the anthology Adventures into the Unknown, premiering in 1948 from American Comics Group, initially under the imprint B&I Publishing.