Joe Russo thinks the best is yet to come with "Avengers 4."

He and brother Anthony Russo have given the Marvel Cinematic Universe "Captain America: The Winter Soldier," "Captain America: Civil War," and "Avengers: Infinity War."

Next May, they'll give us "Avengers 4," which will reveal its official title later this year.

In a new interview with Deadline, Joe Russo called the movie "pure" in that it was made back-to-back with "Infinity War," but before that movie came out. So they weren't influenced at all by the fan response.

Technically, "Avengers 4" isn't done filming, since Joe confirmed they are going back for "some additional photography" in a month or so. But they have been in post-production on the movie since the release of "Infinity War," so it's basically done. And they are very happy with it.

Deadline mostly talked to Joe Russo about the new Syfy series "Deadly Class," but here's the brief portion of their talk about "Avengers 4":

Deadline: "Going from the small screen to the big screen for a sec, and I’m not going to try to get any spoilers out of you, but coming off the critically and financially home run of Avengers: Infinity War, how does the upcoming next Avengers flick feel for you and Anthony now as filmmakers."

Joe Russo: "You know, we’re very proud of it. I think ultimately Avengers 4 may be our best work for Marvel. I think we’ve grown with every movie that we’ve made there. We’ve grown with the characters. We’ve grown with the cast. As filmmakers we’re very happy and very excited with the movie.

You know, it’s always an agenda of ours to block out the outside noise because it can lead you to make some bad choices with the material. We’ve learned over the years just to listen to ourselves, and it’s great that there’s two of us that we can have conversations with each other. We can really stay insulated and reinforce one another in our belief in the story that we’re telling. I feel like with 'Avengers 4,' because it was made before there was any response to 'Avengers 3,' it’s really pure in that regard. The storytelling is very pure. It’s without any sort of external noise creeping in...."

Speaking of the response to "Avengers 3," this past weekend at San Diego Comic-Con, Marvel set up grief counseling for fans traumatized by the end of "Infinity War":

A free donut?! Amazing.

The Marvel SDCC booth also gave Thanos his own "Success" motivational poster:

No new MCU footage was shown at Comic-Con. We're on standby for the first "Captain Marvel" teasers, and that's also when we should learn the "Avengers 4" title.

New question: What happens with the Russos after "Avengers 4"? They have yet to announce their next project for Marvel Studios.

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