Avengers Assemble episodes

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.

A new superhero joins the Avengers as the team reunites at their headquarters in Avengers Tower to take on the dangerous villains that inhabit the planet who are looking to take over various cities in an attempt to bring down the superhero team.

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.

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 named Nighthawk 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 thinks that the Avengers are almost perfect. However, the team has to switch minds when M.O.D.O.K. uses the Mind Stone to take control of S.H.I.E.L.D.

In a flipped reality, where superheroes are super villains and vise versa, Iron Man gets a strange vision after battling the Squadron Supreme. He and the "evil" versions of the other Avengers discover that the Squadron Supreme have the Reality Infinity Gem, and have used it to change the world in their image.