BoJack Horseman Season 5 given the green light by Netflix Netflix announced today they have given the green light to BoJack Horseman Season 5! You can view a short video, in which one of their “clingy execs” texted the pickup news to BoJack, using the player below. Season 4 of BoJack Horseman launched globally on Netflix on September 8, 2017. Will Arnett voices BoJack, the failed legendary ‘90s sitcom star from the favorite family sitcom Horsin’ Around, who has been trying to find his way through a muddle of self-loathing, whisky and failed relationships.