The Avengers face their most dangerous foe yet in Thanos (Brolin), whose lust for the all-powerful Infinity Stones puts him on a direct collision course with Earth's mightiest heroes. While Thor (Hemsworth) teams up with Star-Lord (Pratt) and the Guardians of the Galaxy, Iron Man (Downey Jr.), Spider-Man (Holland) and Doctor Strange (Cumberbatch) fight to keep the Time Stone from Thanos' grasp. Meanwhile, the remaining Avengers take Vision (Bettany) to Wakanda, where they hope to remove the Infinity Stone contained in his forehead, but even that nation's legendary defenses are threatened by the strength of Thanos' minions.
Derek (Olivero) and Sean (Sheehan) have a good setup: while working as valets at a fancy restaurant, they take their clients' cars and use their keys to rob their homes. Unfortunately for them, they find more than electronics and jewelry when they break into the house of Cale Erendreich (Tennant), where they find a young woman being held captive. When the police are unable to find any evidence that the girl was ever in Erendreich's house, the pair of burglars find that they've made a very dangerous enemy who's more than willing to kill to keep his secrets safe.
Enn (Sharp) and his friends are in for the adventure of a lifetime when they come across a group of teenagers from another planet who are visiting Earth as a rite of passage. Enn quickly falls head over heels for Zan (Fanning), an alien of exotic beauty, and the two of them set out for an adventure through London and end up setting off a confrontation between the aliens and young human punks.