Well, this is bound to cause some ripples in the multiverse. For months, the notoriously stingy Marvel Studios had done an admirable job of keeping all details on the upcoming, epic-sized blockbuster "Avengers: Doomsday" under lock and key. The only real promotional effort to date has been that mind-bogglingly questionable stunt involving empty chairs in a warehouse that unfolded for the better part of a day. But, with so much of the filming taking place on studio lots or indoors altogether, there hasn't been much opportunity for eagle-eyes fans or opportunistic photographers to document exactly what's going down on the set of Joe and Anthony Russo's latest "Avengers" movie — a stark contrast from, say, "Spider-Man: Brand New Day" during the Glasgow portions of its shoot .

But things

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