The European country of Slorenia is dead. Every man, woman, and child eliminated with the cold precision of a machine. And out of the flaming remnants of this tiny Baltic state comes a message from its murderer: Mankind's days are numbered because Ultron has returned! He - or it - is one of the Avengers' oldest, most implacable foes, menacing humanity countless times. But never before has Ultron been this dangerous, this deadly. Now, he stands on the brink of committing global genocide, and rebuilding Earth in his own robotic images. Our only hope is a desperate U.N. strike on Slorenia, led by the Avengers themselves. But will it be in time? Will the strength and courage of Earth's Mightiest Heroes be enough in the face of such overwhelming evil? For the sake of the world, it will have to be! Plus: When you're an Avenger, you're one of Earth's Mightiest Heroes - the first line of defense against the dangers no conventional foe could halt, the threats no ordinary man could withstand. Threats including Dominex, Lord Templar, Pagan, and the Thunderbolts! Collects Avengers #12-22, #0 and Annual 1999.

AVENGER VS. AVENGER! Thanos has been defeated, but the Avengers' biggest challenge may come from within their own ranks! Captain America makes a discovery that may tear the team apart! And: Witness the origin of one of the Avengers' greatest villains! COLLECTING: MARVEL UNIVERSE AVENGERS ASSEMBLE: CIVIL WAR #1-4.

Twice the action, twice the danger! THE AVENGERS return for an all-new volume of evil smashing! When RED SKULL seeks refuge on earth from an even greater villain, the Avengers must face their most dangerous foe yet: THANOS OF TITAN! A new chapter in the story of EARTH'S MIGHTIEST HEROES begins here! COLLECTING: MARVEL UNIVERSE AVENGERS ASSEMBLE SEASON TWO 1-4.

Earth's Mightiest Heroes, the Avengers, explode onto the scene with acti on-packed all-ages adventures! The Avengers face their deadliest foe yet (or is that their dead-est foe yet?), when Dracula, King of the Vampires, arrives to drain the team of their powers! Then, the Avengers face the Super-Adaptoid, a powerful robot that can mimic any of their abilities! It's acti on aplenty from your favorite heroes, based on the hit animated series now airing on Disney XD! Collects MARVEL UNIVERSE AVENGERS ASSEMBLE #5-8.

Captain America, Iron Man, Thor, and a large gathering of Avengers battle evil sorceress Morgan Le Fay in a strange medieval reality.

The Avengers must confront their greatest foe yet: Ultron, the sentient robot created by Avenger Hank Pym, who has seized control of the world's media and destroyed the Eastern European country of Slorenia.

Collects Avengers Assemble #1-8. A perfect jumping-on point, featuring the cast of the summer blockbuster - but in Marvel Universe continuity! But who is behind the villianous Zodiac's return? None other than Thanos, the mad Titan, who has claimed Earth as his own! The Avengers team up with cosmic blockbusters the Guardians of the Galaxy to bring Thanos some cosmically-charged pain!