Aidan Gallagher as Number Five in "The Umbrella Academy."Christos Kalohoridis/Netflix12 staff members accused "The Umbrella Academy" showrunner Steve Blackman of "toxic" behavior.Blackman called the allegations "completely false and outrageous."The final season of the Netflix series arrives in August.A showrunner on "The Umbrella Academy" has been accused by 12 staff members of "toxic" behavior, including bullying and sexism, while working on the cult Netflix show."The Umbrella Academy," which was released on the streamer in 2019 and has run for three seasons, follows a group of superheroes who were around the world at the same time before being raised by a mysterious billionaire.It is adapted from the Dark Horse Comics series of the same name by the singer of the rock band My Chemical Romance, Gerard Way, which helped it garner a cult following, and Brazilian comic book artist Gabriel Ba.The show has been fairly successful for the streaming service, with audiences watching 2.454 billion minutes in the first week following the season three premiere in 2022, Deadline reported citing Nielsen streaming rankings.