Marvel is ending its relationship with Marvel Heroes studio Gazillion Entertainment, spelling doom for the super-powered MMO.

"We regret to inform our Marvel Heroes fans that we have ended our relationship with Gazillion Entertainment, and that the Marvel Heroes games will be shut down," said Disney in an email to Kotaku.

"We would like to sincerely thank the players who joined the Marvel Heroes community, and will provide any further updates as they become available."

A shut down date was not specified.

Released in 2013 for PC, Marvel Heroes is a free-to-play title that plays somewhat like a multiplayer superhero-themed Diablo.

It was ported to Xbox One and PlayStation 4 this year.

Marvel Heroes’ former creative director Jeff Donais told Kotaku that the studio's employees were massively overworked.

"It was a real thing that people didn’t see their families as much as they should, or sacrificed their health to work an 80-hour week when an important patch deadline was looming," he said.

"The patch release schedule, especially when PC was the main focus, was aggressively insane.”