American Comics Group (ACG) was an American comic book publisher started in 1939 and existing under the ACG name from 1943 to 1967. It published the medium's first ongoing horror-comics title, Adventures into the Unknown. ACG's best-known character was the 1960s satirical-humor hero Herbie Popnecker, who starred for a time in Forbidden Worlds. Herbie would later get his own title and be turned into a "superhero" called the Fat Fury.

An American comic book is a thin periodical originating in the United States, on average 32 pages, containing comics. While the form originated in 1933, American comic books first gained popularity after the 1938 publication of Action Comics, which included the debut of the superhero Superman. This was followed by a superhero boom that lasted until the end of World War II. After the war, while superheroes were marginalized, the comic book industry rapidly expanded and genres such as horror, crime, science fiction and romance became popular. The 1950s saw a gradual decline, due to a shift away from print media in the wake of television and the impact of the Comics Code Authority. The late 1950s and the 1960s saw a superhero revival and superheroes remained the dominant character archetype throughout the late 20th century into the 21st century.