Russo Brothers' Pic: Why Was Millie Bobby Brown On the Set of Avengers: Infinity War?

The Russo brothers' Facebook photo of Millie Bobby Brown has already triggered a rising tide of speculation as to whether or not the Stranger Things star will appear in Avengers: Infinity War -- and if so, what part will she play?

The photo has a bespectacled Brown seated beside the two brothers. Gone is the trademark baldiness and she sports a cute new hairdo. All three are watching what seems to be scenes taken from the Avengers' current shoot. The Facebook pic has only one phrase: "Guest director Millie Bobby Brown."

The brothers had dropped similar supposedly simple hints in Captain America: CivilWar years ago, and which did make their way into film as important scenes. It is why fans find it hard to believe that this pic is just that: a pic of three friends watching results from a shoot.

An IMDB check will show, though, that Brown has no Avengers-related credential, not on the screen or off it.

Mashable has made a list of potential characters that Brown can play. My own bet is on Polaris, the younger sister of Wanda and Quicksilver (who died onscreen). In the comic books, Polaris is a thirtysomething mistress of magnetism. But Wanda is still very much in her early twenties in the film, which makes the 11-year-old Brown right for the part of Polaris.

Place a photo of Elizabeth Olsen, who plays Wanda, beside that of Brown, and the two actually look like sisters.

If Brown does appear in Avengers: Infinity War, which character do you think she will play?

Avengers: Infinity Wars, directed by Joe and Anthony Russo, will open in cinemas on May 4, 2018.

Unti then, it would be fun to speculate about the badass character that Brown might play in it. After all, she has done it in Stranger Things. Just watch the clip below.