The Mad Titan may not be finished with the Marvel Cinematic Universe just yet. A viral piece of promotional material for Avengers: Doomsday has sparked massive fan speculation that Thanos could return—only to be crushed by Marvel’s newest villain, Doctor Doom. But is it inevitable?

At Disney’s official Marketing Expo in Shanghai, China, Marvel Studios unveiled an Avengers: Doomsday light show highlighting Robert Downey Jr .’s full debut as Victor von Doom . For most of the show, Doom loomed as the centerpiece, his comic-accurate armor glowing across the skyline. But about one minute and fifteen seconds into the spectacle, audiences got a shocking image: Doom holding a skeleton in his hand, basking in triumph, and it's something we've seen before.

Comic fans immediately r

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