The very first time the fans had heard of the Project Pegasus had been in the movie, Iron Man 2. This term had been one of many that were dropped in the film with two other projects- Project Goliath and Project Exodus.
In the film, Ant-Man and the Wasp, we had learned that Hank Pym and Bill foster had been working for the government at some point under Project Goliath. This was a secret initiative for developing size-changing equipment and technology for the United States Government.
In the movie, The Avengers, Captain America does a lot of digging around the Helicarrier and finds out that Shield is actually trying to develop a weapons-grade Tesseract energy harnessing technology for making armaments. This project had been a tripartite agreement between three organisations – Shield, Project Pegasus and Nasa.
Pegasus had been first mentioned in the film when Nick Fury responded to an emergency crisis in the Joint Dark Energy Research Facility which had been located in the middle of the Mojave Desert.
In the movie, Captain Marvel, the character, Wendy Lawson, who is a scientist extraordinaire, had been experimenting on the Tesseract for her own research purposes. Lawson wanted to harness the power of the Tesseract for creating a Faster than Light capable drive for space transport. Lawson’s objective was to take humanity beyond its boundaries. However, the research is all the courtesy of the Air Force, which is a part of Project Pegasus.
President of Marvel Studios, Kevin Feige, had said something very interesting:
“P.E.G.A.S.U.S. was name-dropped … in Iron Man 2, then it’s also at the top of Avengers 1,” Feige had said.
“And it was early on tying her into that early MCU. What do we know about the period of the MCU in the years before Iron Man? Well, the Tesseract and P.E.G.A.S.U.S. were part of it. And then also you’re seeing another side of that same facility was interesting.”
In the comics, Project P.E.G.A.S.U.S stands for Potential Energy Group/Alternate Sources/ United States. The Headquarters of this very initiative was the site of many hostile infiltrations and attacks and a popular one being by the Thing in Marvel’s popular Two-in-One series of comic book arcs.
The last Avengers movie to be released under the MCU banner was Avengers: Infinity War. The official film synopsis for the movie reads:
Iron Man, Thor, the Hulk and the rest of the Avengers unite to battle their most powerful enemy yet — the evil Thanos. On a mission to collect all six Infinity Stones, Thanos plans to use the artifacts to inflict his twisted will on reality. The fate of the planet and existence itself has never been more uncertain as everything the Avengers have fought for has led up to this moment.