Marvel’s The Avengers (2012)

The most successful of all the Marvel Cinematic Universe installments, the first Avengers continues the story revealed with Captain America: The First Avenger and Thor. Loki is the main baddie, though he is just a general for a greater villain, revealed only in the mid-credits scene.

The Trickster God comes to Earth to take over the world, with the help of an alien army (the Chitauri). In order to face this threat, Nick Fury assembles the Avengers – all the superheroes and heroes presented until that point in the Marvel Cinematic Universe.

Loki’s plan is nonetheless more ample than just that and it also involves having the newly assembled team tear itself from the inside – and, until one point, he manages to do that. But the death of a SHIELD agent brings them back together, with Iron Man being the one who saves the city in the end from a nuke deployed by the government.

This is the Marvel Cinematic Universe installment which showed the fans who is the biggest threats of them all – Thanos, who sent Loki to retrieve the Tesseract. It is later on revealed that Thanos gave Loki one of the Infinity Stones, contained in a Scepter, without the Asgardians realizing this.