Refresher on Loki for his Disney+ series

Loki is the adopted brother and son of Thor and Odin, respectively. The god of mischief planned to rule Asgard, but he failed.

Loki wanted to rule Earth with the help of Thanos and his army in The Avengers. Earth's mightiest heroes put a stop to that.

Loki teams up with Thor to save the Nine Realms from the Dark Elves in Thor: The Dark World. He faked his death and disguised himself as Odin.

In Thor Ragnarok, Loki and Thor unleash Surtur to help destroy their evil sister, Hela. This resulted in the destruction of their homeworld of Asgard.

Loki tries to save Thor in Avengers: Infinity War, but he is eliminated by Thanos.

Luckily, The Avengers in Avengers: Endgame accidentally helped 2011's Loki to escape with the Tesseract.

This leads him to the beginning of the series. The Time Variance Authority (TVA) apprehends Loki for messing with the timeline.