When "Captain America: Civil War" hits theaters this weekend, Black Panther and Spider-Man will officially make their Marvel Cinematic Universe debut. During an interview with The Hollywood Reporter, Chris Markus and Steve McFeely weighed in on introducing these big name characters without an origin story, how "Civil War" helped them with "Avengers: Infinity War" and more.

"We needed a character that sat outside of the Avengers who was wronged by their actions and could take party in the festivities, if you will, and not have the same agenda to either side of the Avengers," McFeely explained. "By the same token we needed another fresh face -- an ingenue -- who would work with the Avengers and his arc would be something like, 'Look I am playing on the big team!' We needed those different perspectives on the same conflict, people who didn't have the same angst about everything because they hadn't shared five movies with these people."

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"Part of the fun of comics in coming upon a new character or new superhero that is fully formed and then finding out where the came from," Markus continued. "Spider-Man has had five movies prior to now so it isn't necessary to give them an origin but it's fun to just come in on their kid. The same thing with Panther; this is not his origin in this movie, but he has been introduced so now you can go into the mechanics of a real plot as opposed to having a half-hour where he become that guy and then having less time for plot."

"I think it makes for a better movie if people are just coming in. It also makes for a more organic Universe, where previously existing things are intersecting in an interesting way," he added.

"We would not have included Spider-Man if we had to show him getting bitten by a radio-active spider," Markus shared. "The whole movie is long enough as it is without adding that. The mantra for us was to bring in character's when the story needed them."

On the longevity of the Marvel Cinematic Universe, he said, "There is just so much history now that these characters are finally starting to feel like real people. It's like the fourth or fifth season on a really good TV show. When we signed on to the first Captain America, I would have never thought this place would have become self-sustaining."

McFeely also weighed in on "Avengers: Infinity War," which the duo will write, and how "Civil War" helped them prepare for the film. "We learned with 'Civil War' that you can have different stories that rotate around a central question. So when we have people all of the universe, relating to one central thing, it is going to cohere more than having five separate strands that you are hoping will bang into each other by accident. This is nothing new. In 'Star Wars' there are a lot of different things happening on a lot of different planets but it all comes together."

Directed by Joe and Anthony Russo and starring Chris Evans, Robert Downey Jr., Scarlett Johansson, Anthony Mackie, Sebastian Stan and more, "Captain America: Civil War" opens on May 6, 2016.