Marvel Comics is known best for its legendary line-up of superheroes. Captain America, the Fantastic Four, the X-Men, Iron Man, and countless other heroes line the vaunted halls of the venerable publisher. Through these heroes, Marvel has produced some of the most thrilling and exciting stories in comic book history, but there was a long period of time in which the House of Ideas wasn’t overflowing with superheroes. There was a time when not only were such characters out of fashion, but the entire fate of what would become Marvel Comics rested on stories that dwelled in genres far removed from the world of heroes.
Source：https://www.cbr.com/marvel-horror-comics-explainer/
