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 remake of the pilot will be released to Prime Video on September 10, 2025, alongside a rerelease of the first two seasons, all of which will be fully uncensored. The series follows the employees of I.M.P. (Immediate Murder Professionals), an imp-run assassination company in Hell, on their many different jobs. The members of I.M.P. include Blitzo (pronounced "Blitz"), the boss of the venture, along with weapons specialist Moxxie, powerhouse Millie, and Blitzo's adopted daughter/receptionist hellhound Loona. With the help of an ancient book obtained from Stolas, a Goetial demon of Hell, they access the human world to complete their tasks on order from souls in Hell. The show features a different cast of characters and a different storyline than Hazbin Hotel, another show created by Medrano, despite taking place within the same universe. As Medrano described it, while both shows share the same setting, Helluva Boss follows "characters and societies that already exist in Hell", with the main focus being on interpersonal relationships between characters, while Hazbin Hotel is about redemption and consequences.