Devilman is a Japanese manga series written and illustrated by Go Nagai, which originally started as an anime adaptation of the concept of Nagai's previous manga series, Demon Lord Dante. This 39-episode anime series was developed by Toei Animation in 1972, while Nagai began the Devilman as a manga in Kodansha's Weekly Shonen Magazine, barely a month before the anime series started. The series has since spawned numerous OVAs, manga, novels, and films. Devilman and other characters from the series have shown up in cameo appearances numerous times in Go Nagai's other works. The most notable is Tomoharu Katsumata's 1973 feature film Mazinger Z vs. Devilman, which features Devilman teaming up with Nagai's titular robot to fight Dr. Hell.