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The introduction of the Skrulls to the Marvel Cinematic Universe with next year’s Captain Marvel has unleashed a wave of speculation — if not outright expectation — amongst fans that the next big comic book storyline to be adapted for the screen following Avengers: Infinity War will be Secret Invasion. If true, this means that it’s time for a wave of paranoia that’ll make the days of “Hail Hydra” look like a walk in the park.

The basic concept of Secret Invasion is a simple one: The Skrulls — a race of shape-changing aliens, bent on galactic domination — have a number replacing familiar characters in the Marvel Universe with sleeper agents for years, with the intent on taking over the various power structures on Earth without anyone even aware it was actually happening.

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