Secret Invasion By Brian Michael Bendis Omnibus... Online

Iron Man looked at Captain America. Spider-Woman looked at Wolverine. The questions became a heartbeat. Are you you? Have I been sleeping next to the enemy? The Skrulls had spent years kidnapping heroes and replacing them with sleeper agents so perfect they didn't even know they were spies until a psychic "trigger" word was spoken. Then, the sky cracked open.

This collection ties together years of "seeds" planted by Bendis.

It started with Elektra. When the leader of The Hand fell in battle, her body shimmered and shifted, revealing the green, chin-furrowed corpse of a Skrull. The Avengers stood over her body in a silence that felt like a death knell. The realization was a poison: Anyone could be a fake. Secret Invasion by Brian Michael Bendis Omnibus...

As Queen Veranke stood poised for victory, a single bullet from Norman Osborn—the former Green Goblin—tore through her skull on live television.

A Skrull ship touched down in the Savage Land, and out stepped a roster of heroes from the past—classic suits, old faces, people who had been dead for years. They claimed to be the real ones. They claimed the heroes on Earth were the imposters. Chaos erupted across the globe: was sucked into the Negative Zone. The S.H.I.E.L.D. Helicarrier was crippled by a virus. Thunderbolts Mountain was breached from within. Iron Man looked at Captain America

It ends the "Initiative" era and launches the "Dark Reign" saga. If you'd like, I can: List the essential tie-in issues included in the Omnibus. Explain which characters were Skrulls the longest. Summarize the aftermath for Norman Osborn .

It’s a psychological thriller disguised as a punch-fest. Are you you

The trust was gone before the first shot was even fired. For years, the Skrulls had been the universe’s greatest losers—their throne-world devoured by Galactus, their empire shattered. But Queen Veranke had a new prophecy. They wouldn't conquer Earth through a frontal assault; they would become it.