Earlier this year, American Gods debuted to loads of buzz and positive reviews. The philosophical, trippy adaptation of the classic Neil Gaiman novel became one of the most talked-about shows of early 2017. But, in a shocking turn, the men responsible for its existence are reportedly exiting the Starz show.

Variety reports that Michael Green and Bryan Fuller are exiting American Gods, with disagreements over budget and creative direction cited as the cause. American Gods had already been greenlit for a second season halfway through its first one, and there was talk about folding in other connected works by Gaiman into future seasons. The per-episode budget for season two was reportedly at $10 million and production company Fremantle Media was balking at increasing that.

Fuller and Green were very hands-on lead with many of American Gods’ first season episodes. Fuller also participated very energetically with the show’s fandom, regularly tweeting about specific details when the show aired on Sunday nights.

Genre TV fans might already know that Fuller left the showrunner spot on Star Trek: Discovery to helm American Gods. Fuller’s next project is the Amazing Stories reboot being developed for Apple’s streaming video service. Green’s coming off of a stellar year, with credits on Logan and Blade Runner 2049 to his name. Right now, the future of American Gods is unclear. We’ve reached out to Starz and Fremantle Media for comment and will update this piece if they respond.

Update, 11/29/17, 6:49 PM: Deadline has a few more details on the Fuller/Green exit, including the fact that the pair informed the cast today. Their report also says that more than half of season two’s scripts have been written and that Neil Gaiman himself may come on as a co-showrunner.

Update, 11/29/17, 10:52 PM:

A tweet from Neil Gaiman rules out the possibility of being the next showrunner for American Gods: