The gauntlet's been thrown down, friends.

Earlier this week, the Justice League—in the persons of Ezra Miller, Jason Momoa, Gal Gadot, Ben Affleck and Ray Fisher, of course—announced the Justice League Costume Challenge (see the video below).  The team is challenging fans to the ultimate Halloween cosplay:  Dress as one of the league and post your photos using the #JLHalloween tag, and the league will pick its favorites to be featured on Justice League's social media accounts.

What are you waiting for? Get to building that Justice League costume.