It's been assumed for months and reported in multiple forms from various sources, but now word has come directly from Marvel Studios president Kevin Feige: In "Avengers: Infinity War," the Avengers and Guardians of the Galaxy will meet on-screen for the first time.
"You know that we're onto something within the studio when we hit upon an idea or we see a piece of concept art and all of us in the room go, 'This is cool,'" Feige said in a video released Friday evening by Marvel Studios via Twitter. "And in 'Avengers: Infinity War, the Avengers will meet the Guardians of the Galaxy." Along with Feige's words, a piece of concept art showing Rocket and Thor fighting side by side is seen in the video.
— Marvel Studios (@MarvelStudios) February 11, 2017
Since the earliest days of "Infinity War" production, it's been speculated that the Guardians of the Galaxy would appear, given the wide-ranging nature of the film and its cosmic scale. In August, Vin Diesel (the voice of Groot in "Guardians"), stated that the Guardians of the Galaxy would appear in "Infinity War," and reports subsequently followed with various members of the "Guardians" cast attached to the film. Naturally, this serves as definitive confirmation, with Feige promoting the meeting between the two teams as a selling point of "Infinity War."
Directed by Joe and Anthony Russo, "Avengers: Infinity War" is scheduled for release on May 4, 2018.