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Season One

 Unlike most TV series, Disney XD released twenty five-minute "micro-episodes" online; these micro-episodes followed pre-Breakout story threads, and run together made up several of the first season episodes. 

Season One is available in HD on iTunes, and on-demand on Netflix.  The first half of Season One is also available for viewing on Marvel's web site

Broadcast
Order #
Production # Title Summary Notes
01 006 "The Breakout (Part I)" When the security systems at all four of the super-prisons fails at once, the heroes which will become the Avengers must fight a battle for containment.

First Appearance:

  • Graviton
Marvel:
Full Episode
02 007 "The Breakout (Part II)"  Graviton has escaped the Vault, and he'll destroy all of New York if that's what it takes to get revenge on Nick Fury and SHIELD.
Marvel:
Full Episode
03 001 "Iron Man is Born" Iron Man fights the hordes of HYDRA, and delivers his prisoners to the Vault, where one of them - the Grim Reaper in disguise - tries to break Baron Von Strucker out of jail!

First Appearance:

  • Iron Man MK 6 Armor
  • James "Rhodey" Rhoades
  • Pepper Potts
  • Hydra
  • Nick Fury
  • Maria Hill
Marvel:
Full Episode
04 002 "Thor the Mighty"  Loki arranges for Thor to be distracted by the Wrecking Crew on Midgard while he leads the Frost Giants against Asgard.

First Appearance:

  • Thor
  • Jane Foster
  • The Wrecker
  • Piledriver
  • Thunderball
  • Bulldozer
  • Heimdall
  • Loki
  • Sif
  • Volstagg
  • Hogun the Grim
  • Fandral the Blade
  • Odin
  • Ymir and the Frost Giants

Marvel:

Full Episode
05 003 "Hulk Versus the World" Hulk fights the Absorbing Man, Hulkbusters, and SHIELD, including special agents Hawkeye and the Black Widow.

First Appearance:

  • The Hulk
  • The Absorbing Man
  • Hawkeye
  • Black Widow
  • Doc Sampson
  • Agent Bobbi Morse
Marvel:
Full Episode
06 004 "Meet Captain America" Captain America and the Howling Commandos fight HYDRA and the Red Skull.

First Appearance:

  • Captain America
  • Bucky
  • The Howling Commandos
  • The Red Skull
  • Arnim Zola
  • Baron Von Strucker
Marvel:
Full Episode
07 005 "The Man in the Ant Hill"   Ant Man and Wasp fight Klaw and the Whirlwind.

First Appearance:

  • Ant-Man
  • Wasp
  • Klaw
Marvel:
Full Episode
08 008 "Some Assembly Required"
The Avengers move into the Avengers Mansion.  The Hulk is enchanted by the Enchantress, and turned against the other Avengers! 

First Appearance:

  • Wonder Man
  • JARVIS
Marvel:
Full Episode
09 009 "Living Legend" The Avengers, seeking the Hulk, find the ice-entombed body of Captain America.  Marvel:
Full Episode
10 010 "Everything Is Wonderful" Simon Williams seeks revenge on Tony Stark, undergoing an experimental AIM treatment of ionic bombardment to transform himself into Wonder Man. Marvel:
Full Episode
11 011 "Panther's Quest" The Black Panther recruits the Avengers to help him regain the throne of Wakanda.
Marvel:
Full Episode
12 012 "Gammaworld (Part I)" Villains use gamma energy to turn people into monsters, and the Avengers try to stop them before the entire Earth is under their power.
Marvel:
Full Episode, Part I
Full Episode, Part II
13 013 "Gammaworld (Part II)" The Avengers are turned into gamma monsters, along with half of North America's population, but the Hulk is determined to stop the madness!
14 014 "Masters of Evil" The Masters of Evil come visiting the Avengers. Marvel:
Full Episode
15 015 "459" The Kree have sent a Sentry to destroy the Earth, and the only thing that can prevent them is the Avengers and one of their own - the Kree, Captain Mar-Vell!
Marvel:
Full Episode
16 019 "Window's Sting"  Hawkeye, Mockingbird, the Black Panther, and Captain America take the battle against Hydra to... Hydra Island!  Plus, the Viper pulls the pin on a grenade!
 Marvel:
Full Episode
17 016 "The Man Who Stole Tomorrow" Kang comes back to the 21st century to eliminate Captain America - even over the Avengers' dead bodies!
Marvel:
Full Episode
18 017 "Come the Conquerer" Kang cries HAVOC and lets loose his dogs of war as his forces begin a worldwide invasion
Marvel:
Full Episode
19 018 "The Kang Dynasty" The Avengers attack Kang's flagship in hopes of stopping the invasion of Earth!
Marvel:
Full Episode
20 020 "The Casket of Ancient Winters" On the hottest day of the year, an ancient artifact is found... then a cold wind blows. An ancient relic called the Casket of Ancient Winters has been opened, and the entire planet goes into a deep freeze!
 
Marvel:
Full Episode
21 021  "Hail, Hydra!" Hydra and Aim are waging war against one another, and only one person knows why... the Black Widow. She knows that Aim has created the ultimate weapon for Hydra, a weapon so powerful that Modoc wants it for himself.
Marvel:
Full Episode
22 022 "Ultron-5" Ant-Man has had enough of the violence and wants to find a better way to bring peace to the world... after all, that's why he created Ultron. But something has gone terribly wrong.  Also features the Serpent Society and Super-Apes. Marvel:
Full Episode
23 023 "The Ultron Imperative" As the devastated team struggles with a loss, Ant-Man and Iron Man go about destroying all remnants of Ultron. But they don't realise that Ultron has transcended his body, and has infiltrated the world's computer systems...
Marvel:
Full Episode
24 024 "This Hostage Earth" The end begins! The Masters of Evil mobilise all across the world preparing for an invasion the likes of which Earth has never seen. And unless the Avengers can stop it... the armies of Asgard are coming to Earth.
Marvel:
Full Episode
25 025 "The Fall of Asgard" Lost and separated, the Avengers struggle to survive in the nine realms of Asgard. But with Thor defeated and Iron Man's armor not functioning... what chance do they have?
Marvel:
Full Episode
26 026 "A Day Unlike Any Other" Eight realms have fallen, and only Midgard remains. The Avengers are nothing against his power. Loki has won. Every moment has lead to this.
Marvel:
Full Episode

 

Episodes #21 through 26 are being shown in April in Australia; the information was posted by Kirben at Toonzone; he has my gratitude!

There have been attempts to put false episode names into the Wikipedia and other information sources, including the IMDB.  Be warned and be wary! I will do my best to only post confirmed information.