Due to copyright reasons, some characters such as Quicksilver and the Scarlet Witch (Magneto twins), Doctor Doom and the Green Goblin (Spiderman enemy) were not included in the list. Although all of these characters belong to Marvel / Disney, the character X-Men and Fantastic Four have been licensed for Fox Studios, whereas Sony's Spider-Man license, long before The Avengers made.
The movie once again revolves around the power of Tesseract, blue cube constantly producing renewable energy, which comes from the planet Asgard, and sought after by those who want to have the power to control the world. And one of them, Loki (Tom Hiddlestone), escapes from the planet and intends to master the human race by controlling the Tesseract.
Meanwhile, peacekeeper agents of the Earth using a blindfold, Nick Fury (played by Samuel L. Jackson), must utilize the superhuman ability in order to prevent the occurrence of an intergalactic war.
You must watch it....