When Red Skull comes crashing to Earth with a fleet of alien ships chasing him, the Avengers learn there's a villain in their midst a thousand times more dangerous than the Cabal ever was by the name of Thanos. Upon finding the Power Infinity Gem in Red Skull's possession, the Avengers are led to a gamma-high city to look for something called Arsenal.
With the help of Arsenal, a robot created by Howard Stark for Tony, the Avengers must stop Thanos from gaining the Power Stone - an energy force so powerful that it could cause mass destruction.
Hulk and Thor are tricked into a battle and transported to Valhalla to find out who is the strongest, once and for all. But under Hela's rule, only the loser of their contest may return to Earth while the winner will become her consort and champion.
Red Skull has information that could help the Avengers save the world from Thanos, but an intruder kidnaps Skull before they can retrieve it. Cap discovers that the trespasser is none other than his old partner Bucky Barnes, now the Winter Soldier, who's back and seeks revenge.
When Hawkeye and Black Widow stumble upon the Serpent Crown, they must work together to stop Attuma's battalion from destroying Atlantis.
When a mysterious new villain uses the individualized counter measures Falcon created when he was at S.H.I.E.L.D. to take out the Avengers one by one, he must figure out a way to save his team.
When the Time Stone becomes attached to Tony's arc reactor, it causes him to de-age and brings dangers from other eras, including dinosaurs, into present-day New York City.
Tony believes the Avengers have reached the pinnacle of perfection, but when M.O.D.O.K. uses the Mind Stone to assume control of S.H.I.E.L.D., the team is put to the test as they are forced to swap minds.
In a flipped reality, the Avengers discover that their world has been reshaped by the Reality Stone, wielded by the Squadron Supreme, who are the heroes of this new reality, turning the Avengers into the villains.
When Thor is tricked into returning to Asgard, he and the Avengers discover they must defeat Loki and prevent Earth and Asgard from crashing into one another and foil Loki's plan to escape Valhalla and seek revenge on his brother.
Stranded without his gear in a dangerous realm where technology doesn't work, Falcon must prove to himself and a skeptical Hawkeye that he's still a hero.
The Avengers must protect Widow and Thor as they carry out Widow's plan to rid the Earth of the Infinity Stones before Thanos arrives to claim them and control the Universe.
With the power and might of all five Infinity Stones finally in his gauntlet, Thanos plans to wield his power over the Universe while the Avengers make a desperate attempt to stop him.
Iron Man and Captain America try to rebuild their relationship, until Cap discovers Iron Man's hiding dangerous information about an artificial intelligence unit named Ultron.
An even more powerful Ultron resurfaces and takes control of Avengers Tower and Iron Man's Hall of Armors, leading to the destruction of the Avengers as we know them.
With the team divided and the Avengers Tower wiped out, Tony seeks help from Ant-Man. Learning he's busy fighting MODOK, Tony's team joins Ant-Man to stop the Pym Particle thief.
The Avengers reunite when Captain America and Iron Man learn to appreciate their differences while trying to save the world from ultimate destruction at the hands of Ultron!.
Captain America's team discovers that working for S.H.I.E.L.D. isn't everything they had hoped for when they're expected to unquestionably follow orders involving the Crimson Dynamo and The Winter Guard.
When Ant-Man joins the Avengers, Hawkeye resigns and trains his replacement on Monster Island, unaware that Red Skull is nearby planning to cloak himself using Dormammu's powers!.
The Squadron Supreme's fastest member, Speed Demon, is on the loose and wreaking havoc throughout Avengers Tower. Hulk must save the day by fighting the high velocity villain.
New Avenger, Ant-Man, begins to atone by bringing his former allies to justice. His quest for redemption leads the team to an epic battle with Squadron Supreme's Dr. Spectrum.
Thor is convinced that Zarda wants to defect from Squadron Supreme, but Hulk knows better and must protect Thor from Zarda's duplicitous ways.
The Avengers are challenged by the fully formed and incredibly powerful Squadron Supreme for a battle that will end with only one team as the victor.
Unbeknownst to the Squadron and the rest of the world, the Avengers are in hiding and working on a plan to save the planet and stop the Squadron Supreme once and for all.
When an alien race begs the Avengers to save them from mysterious invaders, the team discovers Thanos is plundering the planet. Meanwhile, Tony seeks new challenges for the team.
When Thanos attacks Earth, planning to finally take over the planet by destroying the Avengers, the team discovers they are more than eight heroes - they are an ideal.
