Even Spider-Man’s webs were not strong enough to hold Sony and Disney together.

After months of negotiations over the terms of their partnership on that film franchise, Sony announced on Tuesday that Kevin Feige, who helped steer Disney’s Marvel Studios and its “Avengers” series to immense global success, will no longer play a role in the next live-action “Spider-Man” movie starring Tom Holland.

The news alarmed fans of the “Marvel Cinematic Universe,” who fear that future big-screen installments of the linked superhero stories would be weakened or even thrown into plot chaos without friendly relations between Sony, which owns the film rights to Spider-Man, and Disney, which owns the rest of the Avengers. Could the M.C.U. go on without your friendly neighborhood web-slinger?

Sony put the onus for Mr. Feige’s departure squarely on Disney. “We are disappointed, but respect Disney’s decision not to have him continue as a lead producer,” the company said on Twitter.