The Mighty Avengers vs. Masters of Evil — Marvel Book Group

What happens when a group of the world's most dangerous villains decide to take on the World's Greatest Heroes? You get the Mighty Avengers vs. the Masters of Evil! 

Alone, the Super Villain mastermind Baron Zemo and the evil robot Ultron have been beaten by the Avengers. But, with the help of some of the meanest villains around, Zemo and Ultron are going to team up to try and defeat Captain America, Iron Man, Thor, and the rest of the Mighty Avengers! 

It's going to be the biggest battle the Avengers have ever seen, and it will take all of their strength, cunning, and teamwork to stand up to: The Masters of Evil!