"Secret Invasion" is a comic book crossover storyline written by Brian Michael Bendis and illustrated by Leinil Francis Yu, that ran through a self-titled eight-issue limited series and several tie-in books published by Marvel Comics from April through December 2008. The story involves a subversive, long-term invasion of Earth by the Skrulls, a group of alien shapeshifters who have secretly replaced many superheroes in the Marvel Universe with impostors over a period of years, prior to the overt invasion. Marvel's promotional tagline for the event was "Who do you trust?".

The "Kree–Skrull War" is a story arc that was written by Roy Thomas, and drawn by Sal Buscema, Neal Adams, and John Buscema. The story was originally published in the Marvel Comics comic book title Avengers #89–97.