The Skrulls are coming to the Marvel Cinematic Universe, and according to the latest news, Captain Marvel will be the beginning of their Secret Invasion.

A dangerous and warlike race of shapeshifters, in the comics the Skrulls have set their covetous gaze upon the Earth many times. EW's exclusive first look at Captain Marvel revealed that the titular hero will head to Earth when she learns the Skrulls are on her homeworld. According to the synopsis, the Skrull leader Talos "spearheads a Skrull invasion of Earth."

Related: Every Captain Marvel Reveal From EW's Cover Story

That single line has caught the attention of every moviegoer who's familiar with the original comics. It's evocative of one of the most important Skrull-centered stories of all time, 2008's Secret Invasion, and it suggests the beginning of a plot that could transform the future of the entire MCU.

Secret Invasion Explained

The early 2000s saw the Avengers divided over the Super Human Registration Act, with Captain America and Iron Man leading rival teams of heroes. When the dust settled from the so-called superhero Civil War, Iron Man had won, and he began to establish a network of superhuman teams across the world. Meanwhile, the remainder of Cap's allies went on the run from the law, continuing their unlicensed superhero careers in spite of S.H.I.E.L.D.'s pursuit. This was the backdrop against which writer Brian Bendis began to develop the Secret Invasion plot. One of the Avengers teams discovered that Elektra, leader of the Hand, had been replaced by a shapeshifting Skrull for years. Disturbingly, the heroes only learned this when Elektra was killed and the body shifted back to its natural state. After examining the corpse, the Avengers realized that there was literally no way to detect a Skrull impostor.

The Skrulls had essentially been overtaken by a group of religious extremists, who were determined to claim the Earth as their new homeworld after their planet was devoured by Galactus. They'd studied Earth's heroes carefully, learning both how to mimic their powers and how to hide from all detection - even magic. Over the course of years, the Skrulls had systematically infiltrated the planet's defenders, compromising both S.H.I.E.L.D. and the Avengers. Tony Stark - who at the time was the new director of S.H.I.E.L.D. - began to sense the scale of the threat, but he didn't know how to counter it. After all, as the tagline for Secret Invasion asked - "Who do you trust?"

With America's superhero community in chaos after the Civil War, the Skrulls accelerated their plans. They used Iron Man's network of teams as a conduit to spread their own influence, and systematically undermined his Initiative. When the invasion itself kicked off, it was with crippling strikes against S.H.I.E.L.D., the Avengers, and the Initiative. Major heroes such as Hank Pym and Spider-Woman were revealed to have been Skrull impostors for years. The Avengers barely defeated the invasion, and the victory came at a terrible cost.

Related: Marvel Movies: The Alien Races You Need To Know About

The strangest thing about "Secret Invasion" is that it took Marvel so long to do it. Until this plot, few Marvel Comics really exploited the idea of a shapeshifting race of aliens. There had been occasional flashes of brilliance; a Skrull impostor fell in lover with the Human Torch, Wolverine was revealed to have been replaced by a duplicate, or the Skrulls secretly infiltrated the Shi'ar Empire. But, when it came to invasions of Earth, until the days of Brian Bendis they'd been treated as just another race of warmongers. That's why "Secret Invasion" has become synonymous with the Skrulls in the minds of comic book readers. It was the first story to develop them to their full potential.

How Captain Marvel's Skrulls Start the Arc

According to EW, the Skrulls have launched their invasion of Earth in Captain Marvel, which is set in the 1990s. Ben Mendelsohn plays the main villain, Talos, and he's apparently gone undercover as a S.H.I.E.L.D. agent. That certainly suggests that, just as in Secret Invasion, the Skrulls have begun their attack by systematically infiltrating Earth's defenders. Presumably their modus operandii is the same as in the comics: identifying key targets, capturing them, and then replacing them. The Skrulls would then work their way up the chain of command, gradually taking on positions of key influence.

There's a sense in which S.H.I.E.L.D. is facing an even worse threat than the one seen in the comics. After all, as far as we're aware this is the first time S.H.I.E.L.D. has encountered aliens in the MCU. What's more, given that they're a race of shapeshifters, S.H.I.E.L.D. probably don't even know they're there, and S.H.I.E.L.D. is unlikely to be the only organization the Skrulls have infiltrated (the US Air Force is confirmed to play some sort of role in Captain Marvel as well). In the comics, the Skrulls have something of a history of launching attacks on Cape Canaveral, so it wouldn't be a surprise if the movie saw them launch a strike against NASA too. The seashore in the above photograph could easily be the beach near Cape Canaveral Air Force Station and the Kennedy Space Center.

The fundamental concept is the same as the comics. The Skrulls have come to Earth, they've begun to infiltrate the planet's power structure, and nobody even knows about the silent threat. This definitely seems inspired by Secret Invasion - but where will the story go from here?

Page 2 of 2: How Will the MCU Handle Secret Invasion?

Skrulls impersonate superheroes in Marvel Comics.

Is Captain Marvel the Secret Invasion?

The MCU has so far been very liberal indeed when it comes to adapting comic book stories for the big screen. Even the closest adaptations take major liberties; take Avengers: Infinity War, essentially a blend of Jim Starlin's Thanos Quest and Infinity Gauntlet comics. While the film ended in a scene lifted straight from the comics, with the Mad Titan extinguishing half the life from the universe, it built up to it in a very different way, and Thanos had a completely different character and motivation to the comic book version. Looking forwards, the distance between comics and films seems only set to increase. That means it wouldn't be a surprise to see the Secret Invasion consigned to one movie, rather than becoming an epic arc running through multiple films.

There are two advantages to this approach. The first is that it allows the Secret Invasion to become a tightly-focused story, centered upon a handful of individuals as they struggle to work out just who they can really trust. In the comics, the build-up to the Secret Invasion was far more effective than the ultimate payoff, because it became a sprawling event story that involved far too many characters, and thus lacked in terms of emotional impact.

Related: The 28 Most Powerful Marvel Heroes Officially Ranked

The second advantage to keeping Secret Invasion contained to one movie is that this avoids repetition. It's safe to assume that Carol Danvers will uncover the Skrull invasion, and ultimately confront the villainous Talos. Any follow-up movie would presumably strike the same notes, meaning it would risk becoming stale. It would be better for Marvel to do this once, and make it work well, than milk it until audiences have become overly familiar with the Skrulls.

Will Phase 4 Continue Secret Invasion?

The Skrulls prepare to attack in the Secret Invasion comic book storyline.

All that being said, the advantage of a shared universe model is that each film coexists with the rest of the franchise. Captain Marvel will introduce the Skrulls to the MCU, and they'll always remain a part of it. Assuming the race aren't somehow rendered extinct, it's certainly that possible Marvel has a longer-term plan in the works.

It's crucial to note that the synopsis for Captain Marvel refers to Talos as the "spearhead" of the Skrull invasion. In military terms, a spearhead is the leading military unit, going ahead of the main attack. That suggests Carol Danvers could be facing a smaller incident here: a single crack team of Skrull warriors who have arrived on Earth in order to prepare the planet for conquest. Captain Marvel's defeat of them would delay the main Skrull invasion, as they adjusted their plans accordingly, but it wouldn't stop it altogether. Presumably the main attack would begin sometime after Captain Marvel, and consequently be running on through the MCU up till now. If that's the case, the Skrull could easily have replaced a lot of key figures - even members of the Avengers. The emergence of the Skrull threat could become an ongoing narrative, with the core "Secret Invasion" in Avengers 5.

Marvel would need to be very careful, though. In the comics, Bendis was very cautious indeed when it came to choosing who had been replaced. This was shortly after the events of Civil War, and the writer realized that it would be something of a cop-out if he implied that the conflict had been orchestrated by the Skrulls, perhaps even with major players really Skrull impostors. The issue becomes even more significant for movies, which tend to be rewatched a lot more. Imagine, for instance, a scenario where it's revealed Happy Hogan has been replaced by a Skrull - an alien who's been monitoring Tony Stark for over a decade. Could viewers rewatch Iron Man 3 and experience it the same way? The studio would need to choose their Skrulls wisely, assessing exactly how each doppelganger forced audiences to reinterpret scenes in previous movies.

It's too soon to say for certain which approach Marvel will take. Will the Skrull invasion be a one-and-done, or will it become a narrative thread that runs on through Phase 4, leading up to the next Avengers movie?

More: Theory: Which of The Avengers Are Actually Skrulls?

Key Release Dates