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The most powerful villains on the planet escape from prison. However, none of the superheroes can stop them without help, not even S.H.I.E.L.D. The Avengers then join forces to fight evil, and discover that as a group they are stronger.
While playing host to the Fantastic Four at Avengers Mansion, the Avengers find themselves under attack by Doctor Doom's forces.
Seeking revenge against Tony Stark, the leader of AIM seizes control of Stark Enterprises' corporate tower.
The Enchantress is on a vindictive hunt for Baron von Zemo and he appeals to the Avengers for help against her.
Ronan the Accuser of the Kree Empire arrives at Earth with Captain Mar-Vel in tow to pass judgment on whether the planet should be annexed or destroyed.
When Henry Pym discovers that his Ant-Man equipment has been stolen and being used by a criminal, he hires Heroes for Hire to recover it.
The Avengers receive a man who appears to have been experimented on by aliens, and now hunted by another extraterrestrial group.
Iron Man learns from Nick Fury that the Avengers has been infiltrated by a Skrull impostor and the team turns against each other.
Thor meets an alien trespasser whose hostility and monstrous appearance belie his unexpected worthiness to wield his hammer, Mjolnir.
SHIELD is apparently attacked by the Hulk, but Banner is accounted for elsewhere at the same time while this Hulk is red in color.
The real Captain America and his fellow prisoners attempt to escape their Skrull prison.
A Skrull team posing as The Avengers invades Wakanda with only Ms. Marvel able to help the Black Panther.
The Skrull Empire initiates their seizure of Earth and the Avengers are hard pressed to thwart it.
With Captain America's reputation now in tatters, the superhero and the similarly maligned Spider-Man find themselves trying to thwart a prisoner transport interception.
Captain America and friends travel to Wakanda to repair his shield, unaware that a powerful android is hunting them to capture it among other objectives.
The Enchantress offers Loki a chance to exact his revenge on Thor and the Avengers for thwarting his conquest of the Nine Realms, and uses a spell to strip Thor, Captain America, and Iron Man of their powers. Now, the helpless heroes must defeat Loki - his soul now in command of a powerful Asgardian weapon known as the Destroyer - without their abilities.
When an Avenger group visits SHIELD's special prison in the Negative Zone, they soon find themselves under siege by a mysterious enemy.
Ultron orders the Vision to lead his android impersonators of the Avengers in capturing the originals.
When Henry Pym is apparently killed, a new vigilante using equipment broadly similar to the scientist's is discovered attacking criminals.
After a month of being dormant for repairs, The Vision finds the world under the control of Tony Stark.
When there is a sudden exposure of a malignant virus around the Avengers mansion, the Secretary of Defense blames the team and lays siege of the headquarters.
