Avengers: Earth's Mightiest Heroes

Feeling as though they can better protect the world as a team, Iron Man, Thor, the Hulk, Ant-Man, and the Wasp assemble and establish themselves as the Avengers. Although more members join for their own gain, they stand by the team to protect the Earth from the likes of terrorists, demigods, time-travelers, and extraterrestrial empires.

The second adaption of the Avengers comic book series, Avengers: Earth's Mightiest Heroes premiered on Disney XD in 2010 to a positive reception. The show ran for two seasons, with the show eventually finding a home on the short-lived programming block Marvel Universe. Instead of continuing with a third season, the newer showrunners retooled the show as Avengers Assemble to more closely resemble the recent live-action movie and its contemporaries on the block.

Some Assembly Required (Season 1, Episode 8)
Mandrill robs a bank and uses his unsettling pheromone powers to subdue a policewoman. The Hulk leaving the team, and his reasons for doing so, are similar to the events of Avengers issue #2. In the episode, Iron Man makes a passing reference that this was their second day as a team.

This Hostage Earth (Season 1, Episode 24)
The Enchantress and the Masters of Evil plan to merge the Nine Realms and rule over them all. Because Baron Zemo knew that Enchantress will betray him, he attaches a mind control neck brace on Enchantress to keep obeying him without her other plans coming into mind.

The Ballad of Beta Ray Bill (Season 2, Episode 8)
Surtur's demonic forces pursue a ship with a colony of Corbonites in stasis. The pilot of the ship, Beta Ray Bill, is joined by Thor and Lady Sif to protect the ship. Thor quickly recognizes the leader of Surtur's forces is The Enchantress, who now has a red outfit and new fire powers to boot. She struggles to tell Thor to end her life, but upon being defeated, Surtur possesses her and tells Thor she is beyond help.

Emperor Stark (Season 2, Episode 19)
Not long after defeating Ultron, Iron Man repairs Vision's body. However, the process will take one month, so Vision hibernates in the mean time. When the repairs are complete, Vision wakes up and finds the world being taken over by Tony Stark (who is secretly being controlled by the Purple Man). Vision finds out what happened with the help of Tony's A.I. J.A.R.V.I.S. (Tony Stark creates a satellite that creates "free energy" then takes over the United Nations). After the exposition, Captain America attacks Vision, but Vison breaks his control by reminding him of his resolve. This episode is based on the Marvel graphic novel Emperor Doom. Doctor Doom even makes a cameo appearance in the episode.