"Avengers: Infinity War" screenwriters Christopher Markus and Stephen McFeely say the deaths that happened in the movie are "real."

They also explained why some of the characters — like Captain America and Black Widow — didn't have a big part in this story.

Warning: Major spoilers below if you haven't seen "Avengers: Infinity War."

Yeah, the ending of "Avengers: Infinity War" was pretty heavy.

And according to the movie's screenwriters, you should just deal with the fact that some your favorite Marvel Cinematic Universe characters aren't coming back for the sequel.

In an interview with BuzzFeed, Christopher Markus and Stephen McFeely made a point to say that the fourth "Avengers" movie — which is also the conclusion to what took place in "Infinity War" — will be different.

The next movie "doesn't do what you think it does," Markus said, describing the deaths in the movie as "real."

"I just want to tell you it's real," he said, "and the sooner you accept that, the sooner you will be able to move on to the next stage of grief."

Wow!

McFeely added: "I think ['Infinity War'] is a fairly mature movie for a blockbuster. It's got a lot of fun in it, obviously, but boy, it gets very mature. The second one is also mature. We're going to own these choices, and hopefully surprise and delight you and get you invested. It's by the same studio, the same filmmaking team. They were written at the same time, shot at the same time. They're clearly connected, but they are definitely two different movies, one of which is dependent on what happened previous."

Obviously, the writing duo didn't want to give away what happens in the next movie, but you have to wonder now if some (or all) of the heroes who faded away at the end of the movie aren't coming back. Those who perished before the end — Loki, Heimdall, Gamora, and Vision — are almost certainly not coming back.

Captain America and Black Widow will play a larger role in the next movie. Marvel Studios

But if you weren't already freaking out that Black Panther, Groot, Spider-Man, Star-Lord, Bucky, and the rest won't be back to take on Thanos in the next movie, these comments are going to throw you for a loop.

In the comics, things are brought back to normal. But perhaps it won't be that simple in the movies.

Markus and McFeely also said there was a reason that beloved characters like Captain America and Black Widow were not featured heavily in "Infinity War."

"Some characters were better served in movie two after this event," McFeely said. "We were making some choices based on some characters we knew were going to leave us at the end of the first movie, so they got highlighted in the first movie. And some who were going to be in the second movie more maybe got less attention or less screen time [in 'Infinity War'] — I'm thinking of Cap and Natasha, specifically. It's about the story we wanted to tell in movie two, mostly."

We'll see how everything plays out and who's really dead when the next "Avengers" movie comes out next year.