Marvel has thrown down the gauntlet.

Avengers: Infinity Warhas started production at Pinewood Studios in Atlanta, where Robert Downey Jr., Tom Holland and Chris Pratt, standing on the same set, have finally begun to bring it all together. Or as Kevin Feige puts it, "the culmination of the entire Marvel Cinematic Universe as started in May of 2008 with the release of Iron Man."

There is no Infinity Warfootage in this 3-and-a-half-minute first official teaser/featurette/production start thingy, but a fistful of bits from previous films complete a powerful little reminder of where it's all been headed.

Thanos is coming.

Avengers: Infinity Wararrives in theaters May 2018.