Earlier this week, the Russo brothers marked Day 63 of the "Avengers: Infinity War" shoot, and shortly after that, another star confirmed his role in the movie by posting an intriguing set photo/video.

This third "Avengers" movie is going to be massive, and to illustrate that, the directors showed the sheer number of trailers on set for one day. (As one fan joked, "Half of those trailers are @robertdowneyjr 's.")

Day #63 of Infinity.

A post shared by The Russo Brothers (@therussobrothers) on

Last night, Chadwick Boseman added himself to the scale of the production, confirming what everyone suspected, that Black Panther will of course be in "Infinity War," after being introduced in "Captain America: Civil War" and starring in his own "Black Panther" film. But did you know that T'Challa would be the center of a Captain America/Black Widow sandwich?

It's not much of a video when there's no real sound or movement, beyond water lapping in the background. But fans were happy to see Black Panther join the fold, and some were especially happy to see evidence of a Steve/Natasha scene:

Yeah, but that's probably not the big takeaway he was hoping for. This might be, though:

Most fans were just happy to see the three characters together, whatever they do:

"Infinity War" is going to include every superhero and their cousin, so it will only be shocking to hear who's not in it. (Besides DC characters.)

Here's the movie synopsis:

"As the Avengers and their allies have continued to protect the world from threats too large for any one hero to handle, a new danger has emerged from the cosmic shadows: Thanos. A despot of intergalactic infamy, his goal is to collect all six Infinity Stones, artifacts of unimaginable power, and use them to inflict his twisted will on all of reality. Everything the Avengers have fought for has led up to this moment - the fate of Earth and existence itself has never been more uncertain."

"Avengers: Infinity War" opens May 4, 2018, followed by "Avengers 4" on May 3, 2019. But first, Boseman's "Black Panther" movie opens February 16, 2018.

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