This is an episode list for The Avengers: Earth's Mightiest Heroes. The series is based on the Marvel Comics superhero team, the Avengers. A 20 part micro-series focusing on each hero's backstory debuted on September 22, 2010 on Disney XD. The first season premiered on Disney XD in the United States on October 20, 2010. The second season premiered on April 1, 2012.
 A micro-series, consisting of five-and-a-half-minute "micro-episodes" created from the footage from season-one episodes, premiered online and on Disney XD on September 22, 2010. Series supervising producer Josh Fine said the goal was to "let us explore the individual members of the team in their own ongoing adventures ... do a lot of character development and set the stage for the rest of the season". The last micro-episode aired online on October 11, 2010 and on Disney XD on October 15, 2010.
 Iron Man saves the world's leaders from a HYDRA attack on the United Nations.
 Bruce Banner confronts the Absorbing Man, causing him to transform into the Incredible Hulk.
 Ant-Man stops Ulysses Klaw from stealing a rare sample of vibranium.
 HYDRA unleashes the Dreadnoughts against Iron Man.
 The Mighty Thor stops the Wrecking Crew from stealing Stark Industries technology.
 S.H.I.E.L.D. agents Hawkeye and Black Widow join the battle to take down the Incredible Hulk after General Ross' Hulkbusters were defeated.
 Thor is summoned to defend Asgard from an army of Frost Giants, led by Loki.
 Nick Fury fights the Grim Reaper when he infiltrates the Vault to free Baron Strucker.
 Hawkeye and Black Widow take on the Hulk.
 Loki is banished to the Isle of Silence by Odin where he contemplates the events that lead him there.
 The Wasp puts an end to Whirlwind's rampage.
 Introducing characters: Whirlwind
 Captain America leads an assault on a HYDRA facility.
 King T'Chaka is challenged to a duel for control of Wakanda.
 Kang the Conqueror discovers that his timeline is somehow being destroyed by Captain America.
 Ant-Man quells Whirlwind's riot inside the Big House, the world's smallest supervillain prison. S.H.I.E.L.D. learns that Whirlwind is a mutant and plans to have him handed over to the Mutant Response Division. Meanwhile, Whirlwind learns from Mad Thinker that the Big House is one of the four supervillain prisons and that when their systems break down, every villain will take the opportunity to escape.
 The first season premiered on October 20, 2010 with the two-part episode "Breakout", continuing on from the events of the online micro-series. This move meant that the series did not air on television in chronological story order; the broadcast of "Breakout" was followed by the episodes "Iron Man is Born", "Thor the Mighty", "Hulk Versus the World", "Meet Captain America", and "The Man in the Ant Hill", each one a compilation of four micro-series episodes, which all take place before "Breakout". The series took a hiatus after "The Kang Dynasty" and returned on May 15, 2011 in the United States.
 The series was broadcast around the world and released on DVD in the correct chronological story order (production order). The season finale debuted in Australia on April 12, 2011, then aired on June 26, 2011 in the United States. The first half of Season 1 was released on home video on April 26, 2011, and the second half was released on October 25, 2011.
 After defeating HYDRA's attack on the United Nations, Iron Man learns that S.H.I.E.L.D. is taking control of his technology.
 After stopping a robbery attempt by the Wrecking Crew, Thor returns to Asgard in order to defeat Loki and the Frost Giants.
 Hulk tries not to get captured by S.H.I.E.L.D. and Hulkbuster units, while Hawkeye is betrayed by Black Widow who is apparently working for HYDRA.
 Kang the Conqueror revisits a time where Captain America and Bucky took down a HYDRA portal to Asgard as Kang believes Captain America is responsible for destroying Kang's timeline.
 Ant Man and Wasp take down Klaw and Whirlwind. Afterwards Klaw helps M'Baku (a.k.a. the Man Ape) take down T'Chaka and become king of Wakanda. But T'Challa dons the Black Panther suit and flees to look for help.
 A mass breakout occurs at each of the four supervillain prisons.
 Ant-Man/Giant-Man, Hulk, Iron Man, Thor and Wasp band together to battle Graviton after he escapes from the Raft and targets Nick Fury.
 Introducing characters: LMD
 Hulk is magically manipulated by the Enchantress to attack his teammates.
 After Captain America's frozen body is discovered in the Arctic, Arnim Zola unleashes Doughboy on New York City to distract the Avengers while Baron Zemo battles Captain America.
 Based on Avengers #4.
 Enraged by Tony Stark buying out his company, Simon Williams becomes a deadly being of ionic energy, Wonder Man, in order to exact revenge. Meanwhile, Wasp and Thor chase a group of A.I.M. agents to find their secret hideout and run into another villain, MODOK.
 Based on Avengers #9.
 T'Challa, the new Black Panther, meets the Avengers and tells them that his country has been overthrown by Man-Ape. As the Avengers arrive in Wakanda, not only do they have to help T'Challa reclaim his family's throne and country, but they also have to deal with Klaw, the Grim Reaper, and HYDRA, who are planning to steal the Vibranium shards in Wakanda's mines.
 The Leader has placed an expanding dome of pure gamma radiation around the Cube, with anyone caught inside it being mutated into a Gamma Monster. The Avengers, along with the support of S.H.I.E.L.D., enter the Cube in an attempt to the destroy the Gamma Generator. 
 With Abomination, Crimson Dynamo, Wonder Man, Enchantress and Executioner on his side, Baron Heinrich Zemo leads them as the Masters of Evil in a systematic takedown of the Avengers. 
 Wasp and the Avengers meet Captain Marvel and team up with him to stop a Kree Sentry from destroying the planet. 
 Based on Fantastic Four #64 and MARVEL Super-Heroes #12
 Hawkeye, Captain America, Black Panther, and S.H.I.E.L.D. agent Mockingbird take on HYDRA in order to find Black Widow.
 Kang the Conqueror comes from the 41st century to destroy Captain America, who Kang believes may soon cause his timeline to cease to exist.
 Based on Avengers #8.
 The Avengers fend off Kang's invasion of Earth while Iron Man tries to locate Kang's ship. 
 The Avengers attack Kang's ship with the help of the last of the Ultrons.
 Based on Avengers: Kang Dynasty
 The Avengers must stop Malekith the Accursed after he obtains the Casket of Ancient Winters. 
 Based on Avengers #249
 Ant-Man, tired of the unending violence, quits the team while Ultron attempts to bring about peace.
 The Masters of Evil (now joined by Chemistro, the Grey Gargoyle, and the Living Laser) prepare for a full-scale invasion of Earth...and unless the Avengers can stop them, the legions of the Nine Realms are coming to Earth. 
 Lost and separated, the Avengers struggle to survive in the Nine Realms.
 The Avengers battle Loki in Asgard as the other realms fall.
 Marvel Animation and Disney XD later confirmed a second season of the series. The first episode was publicly shown at the 2011 San Diego Comic-Con in June 2011 and again at New York Comic-Con in October 2011 before its television broadcast.
 Doctor Doom's forces attack the Avengers and the Fantastic Four, kidnapping the Wasp and the Invisible Woman. 
 Based on Avengers #25 and Avengers #154-156.
 A.I.M.'s Scientist Supreme unleashes Technovore, providing a distraction for an armorless Tony Stark while the A.I.M. agents fight Black Panther, Captain America, and War Machine in an attempt to steal Stark Industries' technology.
 The Enchantress seeks revenge on Baron Zemo and the Masters of Evil for betraying her, and the remaining supervillains go to the Avengers for protection. 
 A Kree ship led by Ronan the Accuser arrives and attacks a S.W.O.R.D. ship. While Abigail Brand fights the Kree soldiers in space, the Avengers are assisted by Ms. Marvel in fighting Ronan and an army of Kree soldiers on Earth. 
 When Hank Pym's Ant-Man/Giant-Man suit is stolen, he enlists the Heroes for Hire to find the thief, but Pym soon learns that this isn't a common robbery.
 Based on MARVEL Premiere #47.
 When a mysterious man known as Michael Korvac is discovered, the Avengers must figure out exactly what happened to him - all while defending him from the team of beings who have come after him: the Guardians of the Galaxy.
 Introducing characters: Michael Korvac, Guardians of the Galaxy (Star-Lord, Adam Warlock, Groot, Rocket Raccoon, Quasar), Corrina Korvac
 Nick Fury returns, having assembled a team of heroes in secret (himself, Black Widow, Mockingbird, and Quake) to gather information about the impending Skrull invasion of Earth. 
 Thor is attacked by a powerful creature known as Beta Ray Bill - who proves himself just as able to lift and wield Mjölnir. Thor and Sif soon finds themselves allying with this strange warrior (who apparently has his own reasons for disliking Surtur) to save all of Asgard from being burned to the ground by the demon lord of Muspelheim.
 Based on Thor #337-338.
 A mysterious red-skinned Hulk attacks the S.H.I.E.L.D. Helicarrier. While Wasp and Captain America fight this new behemoth (who Maria Hill fervently believes is the Hulk gone rogue), Hawkeye attempts to keep a resistant Bruce Banner safe.
 Based on Hulk Vol. 2 #1-6.
 After being a prisoner of the Skrulls for months, Captain America teams up with other prisoners, including some of his enemies, to escape. But in order to do so, they must first get past the mighty Super-Skrull...
 The Skrulls' invasion of Earth has begun - and Wakanda is the first target. Ms. Marvel comes to the rescue, but must deal with both a stubborn Black Panther and a team of Skrulls posing as the Avengers.
 Based on Secret Invasion #1-4.
 The Skrulls have invaded the entire planet and are using Captain America's position of respect to convince the humans to submit. When Hawkeye, Wasp, and Ms. Marvel are captured by Veranke's army of Super-Skrulls, all seems lost - until Iron Man and Thor are reunited with the real Captain America in a last-ditch effort to drive back the Skrull onslaught and save Earth.
 Based on Secret Invasion Vol. 1 #5-8 and Secret Invasion: Fantastic Four #1-3.
 Captain America teams up with the equally mistrusted Spider-Man to fight the Serpent Society when they try to rescue Viper and King Cobra from S.H.I.E.L.D. custody.
 With Thor and Hawkeye in tow, Captain America travels to Wakanda to have his shield repaired and to persuade Black Panther to rejoin the team. But a mysterious figure known only as the Vision arrives to steal the shield - along with Wakanda's supply of vibranium.
 Based in part on Avengers #57. 
 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.
 Stranded in the Negative Zone, the Avengers must join forces with their enemies - including former members of the Masters of Evil - to fight off an army of strange insectoid creatures that are laying siege to 42.
 The Avengers are ambushed and captured, one by one, by Ultron's team of synthezoid Avengers as part of the wayward android's plan to rid the world of "flawed" humans, perfect himself, and construct a mate.
 Based on Avengers Vol 3 #0, #19-22
 A mysterious explosion seemingly kills Hank Pym in his college laboratory, but as the Avengers and their friends mourn the loss of their fallen comrade-in-arms, a fearless new vigilante calling himself Yellowjacket - endowed with the same powers and technology as Ant-Man/Giant-Man and Wasp - begins taking out the members of the Serpent Society.
 Introducing characters: Yellowjacket
 The Vision awakens after a month of repairs to find that Tony Stark and his fellow Avengers have taken over the world. With the whole planet turned against him, the Vision must get to the bottom of Stark's "utopia" - only to discover an unlikely figure to be the true power behind the Avengers' throne.
 Based on the 1987 Marvel graphic novel Emperor Doom (albeit with a different cast).
 Strange fumes sicken all of the Avengers - save for Iron Man, whose suit of armor provides him with protection. 
 Captain America ponders the mystery of the Winter Soldier and enlists Nick Fury's aid to find him when the Red Skull escapes from prison and massive robots - the Sleepers - arise as part of a contingency plan by the founder of HYDRA to destroy Washington, D.C.
 Based on Captain America Vol 5 #8-9 #11-14.
 Kang the Conqueror is freed from prison by his alternate timeline doppelgangers and attempts to conquer the world once again, this time trapping the Avengers in a temporal void to keep them from getting in the way of his plans. Now a new team of heroes (Spider-Man, War Machine, Wolverine, Iron Fist, Luke Cage, and the Thing) must band together to stop the cross-temporal onslaught.
 The Kree attempt to create a wormhole connecting Earth's solar system with their galaxy, which will consequently destroy the Sun and all life on Earth - just as Kang the Conqueror predicted. The Avengers and Captain Marvel head into space to stop it.
 Based on Operation: Galactic Storm
 The Avengers arrive on the Kree homeworld of Hala, but find that they aren't exactly welcome there - even with Captain Marvel on their side.
 The Avengers must bring forth an army of nearly all their allies to face their greatest challenge yet - Galactus, the devourer of countless worlds and civilizations, and his quartet of heralds drawn from the very elements of nature. Galactus first sends forth his heralds to oversee the construction of devices around the world to aid him in consuming Earth. Terrax is sent to New York City, while Airwalker is sent to a polar region, Stardust to the middle of an unspecified ocean, and Firelord to an active volcano. The Avengers then call their allies, splitting up into five different teams. Terrax is engaged by Captain America, Iron Fist, Spider-Man, War Machine, and Quake; he is disarmed by Spider-Man before being defeated by the former two and his device destroyed by the latter two. Airwalker is engaged by Thor, Vision, Falcon, Luke Cage, and Black Widow; he is defeated by Vision after Thor heavily weakens him while his device is destroyed by explosives planted by the latter two as Falcon aids their escape. Stardust is engaged by Human Torch, Wasp, Hawkeye, Wolverine and Thing; she is defeated after Human Torch stuns her with a stream of fire and Wasp destroys her from the inside out, with her device being destroyed by several explosive arrows from Hawkeye. Firelord is engaged by Scott Lang, Black Panther, Hulk, Bucky Barnes, and Invisible Woman; under Black Panther's leadership, Invisible Woman greatly depowers Firelord by depriving him of oxygen before Hulk thunderclaps Firelord, dissipating him. Firelord's device is subsequently destroyed by Bucky's rocket launcher. Meanwhile, Iron Man, Ms. Marvel, Reed Richards, Hank Pym, and Doc Samson infiltrate Galactus's ship, but their plan is ruined after Hank Pym attempts to shrink Galactus. Galactus then attempts to destroy the planet himself, and is stopped by a combined effort from multiple Avengers, pushing him into a portal to the Negative Zone where he can consume energy forever.
 Introducing characters: Galactus, Heralds of Galactus (Air-Walker, Firelord, Stardust, Terrax)