Justice LeagueNot long after Warner Bros. announced that "Justice League: Part One" would start filming in April, director Zack Snyder released a behind-the-scenes teaser photo from Leavesden studios in London, where he is presumably in pre-production.

The pic shows Snyder posing with former "Game of Thrones" star Jason Momoa, who will play Aquaman:

If you squint hard enough and examine the background of the image, you can see a little bit of the movie's costumes, including what appears to be the outfit for The Flash (to be played by Ezra Miller). It's dark red, with the familiar lightning bolts on the head piece.

Next to that, there's the armor for Aquaman (with the tell-tale A on the belt), but even more interesting is the artwork for what looks to be his wife Mera's costume.

"Justice League: Part One" teams up Batman, Superman, Wonder Woman, Aquaman, and The Flash, as well as some other superheroes. It's slated for release Nov. 17, 2017.

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