Helluva Boss is an American adult animated musical black comedy web series created by Vivienne "VivziePop" Medrano. It revolves around the misadventures of the employees of I.M.P., a company in Hell that offers hitman services in the realm of the living. The pilot was released on November 25, 2019, before the series premiered on October 31, 2020. Set in the same fictional universe as Hazbin Hotel, the show is produced by SpindleHorse. The first season was released exclusively on Medrano's YouTube channel. The second season premiered on July 30, 2022. A spin-off short series titled Helluva Shorts was also released in April 2024. In April 2025, it was announced that the third and fourth seasons will be released on Prime Video first, subsequently releasing on YouTube a month after. A reimagining of the pilot, titled "Mission Zero", was released to Prime Video on September 10, 2025, alongside a re-release of the first two seasons, all of which are fully uncensored. "Mission Zero" was released to YouTube on October 25.