With the nudie market beginning to wane, Lewis and Friedman entered into uncharted territory with 1963's seminal "Blood Feast", considered by most critics to be the first "gore" film. Because of the unprecedented nature of this type of film, they were able to cater to the drive-in theater market that would have been inaccessible with their prior skin flicks. "Two Thousand Maniacs!" (1964) and "Color Me Blood Red" (1965) followed the same formula. The full-color gore on display in these films caused a sensation, with horror film-makers throughout the world becoming eager to saturate their productions with similarly shocking visual effects.