The Avengers: Earth's Mightiest Heroes (Production Series)

The original production series of what could've been in The Avengers: Earth's Mightiest Heroes.

Season 1 (2010-2011) - Origins

 * 1) Iron Man Is Born: Iron Man learns that S.H.I.E.L.D. is taking controls of his suits.
 * 2) Thor The Mighty: Thor must defeat Loki and the Frost Giants.
 * 3) Hulk Vs. The World: Hulk tries not to get captured while Hawkeye is betrayed by Black Widow.
 * 4) Meet Captain America: Captain America and Bucky have to deal with HYDRA.
 * 5) The Man In The Ant Hill: Ant-Man and Wasp take down Klaw and Whirlwind.
 * 6) Breakout Pt. 1: A mass breakout occurs at each for the four supervillain prisons.
 * 7) Breakout Pt. 2: 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.
 * 8) Some Assembly Required: Hulk is magically manipulated by the Enchantress to attack his teammates.
 * 9) Living Legend: 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.
 * 10) Everything Is Wonderful: 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.
 * 11) Panther's Quest: T'Challa, the new Black Panther, meets the Avengers and tells them that his country has been overthrow 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.
 * 12) Gamma World Pt. 1: 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.
 * 13) Gamma World Pt. 2: With the Avengers turned into Gamma Monsters, Hawkeye must convince the Hulk to help fight the Leader and the Abomination while Thor (who was unaffected by the Gamma Dome) fights the Absorbing Man.
 * 14) Masters Of Evil: With Wonder Man, Enchantress, Executioner, Crimson Dynamo, and Abomination on his side, Baron Heinrich Zemo leads them as the Masters of Evil in a systematic takedown of the Avengers.
 * 15) 459
 * 16) Widow's Sting
 * 17) The Man Who Stole Tomorrow
 * 18) Come The Conqueror
 * 19) The Kang Dynasty
 * 20) The Casket Of Ancient Winters
 * 21) Hail, HYDRA!
 * 22) Ultron-5
 * 23) The Ultron Imperative
 * 24) This Hostage Earth
 * 25) The Fall Of Asgard
 * 26) A Day Unlike Any Other

Season 2 (2012-2013) - Cosmic

 * 1) The Private War Of Dr. Doom
 * 2) Alone Against A.I.M.
 * 3) Acts Of Vengeance
 * 4) Welcome To The Kree Empire
 * 5) To Steal An Ant-Man
 * 6) Michael Korvac
 * 7) Who Do You Trust?
 * 8) The Ballad Of Beta Ray Bill
 * 9) Nightmare In Red
 * 10) Prisoner Of War
 * 11) Infiltration
 * 12) Secret Invasion
 * 13) Along Came A Spider...: 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.
 * 14) Behold...The Vision!
 * 15) Powerless
 * 16) Assault On 42
 * 17) Ultron Unlimited
 * 18) Yellowjacket
 * 19) Emperor Stark
 * 20) Code Red
 * 21) Winter Soldier
 * 22) The Deadliest Man Alive
 * 23) New Avengers
 * 24) Operation Galactic Storm
 * 25) Live Kree Or Die
 * 26) Avengers Assemble

Season 3 (2013-2014) - Magic

 * 1) Armor Wars
 * 2) Sorcerer Supreme
 * 3) Struck By Thunder
 * 4) Hidden Agenda
 * 5) Beware The Witch!
 * 6) Superhuman Registration Act
 * 7) Blood On The Moors
 * 8) Thunderbolts
 * 9) The Sensational She-Hulk
 * 10) Whose Side Are You On? - Part 1
 * 11) Whose Side Are You On? - Part 2
 * 12) Civil War
 * 13) The Death Of Captain America
 * 14) Spirit Of Vengeance
 * 15) Whom The Gods Would Destroy!
 * 16) Enter The Dark Dimension
 * 17) West Coast Avengers
 * 18) Trial By Fire
 * 19) The Devil, You Say...
 * 20) Witch Of Wundagore Mountain
 * 21) Inferno!
 * 22) Twilight Of The Gods - Part 1
 * 23) Twilight Of The Gods - Part 2
 * 1) Inferno!
 * 2) Twilight Of The Gods - Part 1
 * 3) Twilight Of The Gods - Part 2

Avengers

 * Tony Stark / Iron Man
 * Steven Rogers / Captain America
 * Thor Odinson
 * Janet Van Dyne / Wasp
 * Bruce Banner / Hulk
 * T'Challa / Black Panther
 * Carol Danvers / Ms. Marvel
 * Wanda Maximoff / Scarlet Witch
 * Pietro Maximoff / Quicksilver

New Avengers

 * Peter Parker / Spider Man
 * Col. James "Rhodey" Rhodes / War Machine
 * Luke Cage
 * Ben Grimm / Thing
 * Wolverine

Avengers West Coast

 * Clint Barton / Hawkeye
 * Bobbie Morse / Mockingbird
 * James Rhodes / War Machine
 * Victor Shade / Vision
 * Hank Pym / Yellowjacket
 * Greer Grant / Tigra

Secret Avengers

 * Steve Rogers
 * Winter Soldier
 * Beast
 * Black Widow
 * Valkyrie
 * Agent Venom
 * Moon Knight

HYDRA

 * Johann Smidt / Red Skull
 * Viper / Madame Hydra
 * Baron Von Strucker
 * Baron Zemo

AIM

 * MODOK
 * Scientist Supreme

Trivia

 * As the article was left unfinished, Uncanny X-Factor allowed the community to continue adding to it.