The Marvel Universe is under siege from within! Captain America, secretly a true believer in the cause of Hydra, has turned his back on the Super Hero community. Using the trust and respect he has gained over the years he has ascended to a position where he can enacts Hydra's ideals. The death of Jack Flag, the trial of Maria Hill, the second Civil War, the alien Chitauri Queen. All of the dominos of Captain America's plan have been laid out – and it will take only the slightest push to set them into action! Now, the Avengers, the Champions, the Defenders, the Guardians of the Galaxy, the X-Men and more will be tested. As Hydra's grip tightens around the Marvel Universe, the heroes stand at the precipice of an unprecedented challenge. How will they Marvel Universe cope with this shattering betrayal by the most trusted among them?

As Hydra puts their plans into action, Nick Spencer and Andrea Sorrentino bring you the opening salvo in a story that will rock the Marvel Universe and leave fans' jaws on the floor!

It's been building for months, across a bevy of titles! But now, the moment has arrived for Steve Rogers to step into the light and declare his allegiance to Hydra! How can the heroes of the Marvel Universe cope with this shattering betrayal by the most trusted figure among them? And what will this mean for the world? The map of the Marvel Universe changes in ways nobody will expect—TRUST THE SECRET EMPIRE!

Enshrouded in darkness, plagued by the minions of Baron Mordo and cut off from all assistance, The Defenders and Doctor Strange struggle to save the lives of the innocent people consigned to this hell on Earth. Will Dagger prove to be the key to stopping this nightmare? Meanwhile, will the appearance of a new hero provide Iron Man with the key to Captain America's startling change? THE SECRET EMPIRE WILL DEFEND YOU!

Under constant attack from wave after wave of invading Chitauri aliens, Captain Marvel and the deep space task force under her command is waging a war of attrition—one they may not be able to survive! And back on Earth, things aren't looking too rosy for Hawkeye and his band of renegade heroes, either! But worry not—THE SECRET EMPIRE WILL AVENGE YOU!

There is a power that can either save the world or doom it! Both Steve Rogers and the heroes arrayed against him need this power! But unfortunately for all of them, the key to possessing this power lies in the hands of the unstoppable Ultron! LIVE IN X-CITING TIMES! SECRET EMPIRE!

They thought they were safe! They thought they could handle anything that was thrown against them! But the united heroes of the Marvel Universe never reckoned on the dread power that Steve Rogers would unleash! THE SECRET EMPIRE WILL AMAZE YOU!

The unworthy, the untrusted, the unstable—this is their day! BEWARE THE SECRET EMPIRE!

It was foretold by Ulysses, it's haunted Spider-Man's nightmares for months, and now the moment has arrived: It's time for Miles Morales to kill Captain America! Unless Natasha…

UNITED WE STAND – against the SECRET EMPIRE!

UNITED WE STAND – against the SECRET EMPIRE!

Can there be any redemption for Captain America as the SECRET EMPIRE starts to crumble?

Hydra has fallen, but the world is still not secure! As the heroes of the Marvel Universe stir from the wreckage of the battlefield, the inevitable rebuilding must begin. However, one question hangs in the air over the proceedings: What redemption can there be for Captain America?

2017's most startling and unexpected comic book event! Captain America, Sentinel of Liberty, has been living a lie! The world's greatest hero is secretly a true believer in the cause of Hydra, brought up since childhood to pursue their mission of progress through authority and unity through adversity! Using the trust and respect he is accorded by the great powers of the Marvel Universe, Steve Rogers has worked his way into a position where he can make Hydra's ideals a reality -and change the landscape of the world dramatically! Now, all the dominos of Steve's plan have been laid out - and it will take only the slightest push to set them into action! Hail Hydra! Collects Secret Empire #0, Secret Empire #1-10, Secret Empire Omega #1, Captain America #25 and material from Free Comic Book Day 2017 (Secret Empire 1).