Ragnarök

Ragnarök is an event in the Marvel Cinematic Universe's Thor trilogy and is the doomsday in Asgardian culture.

History
After learning from Surtur that his brother was alive, Thor went back to Asgard and proved to their people that Loki had been posing as Odin the past four years. Odin is near death when his sons find him, where he tells them of their older sister, Hela.

Asgardian Faction

 * Thor
 * Loki Laufeyson
 * Valkyrie/Brunnhilde
 * Bruce Banner
 * Heimdall
 * Korg
 * Sakaaran Rebels

Hela Faction

 * Hela (commander)
 * Fenris
 * Berserkers

Surtur Faction

 * Surtur
 * Fire Demons
 * Fire Dragons

Casualties

 * Thor (loses an eye)
 * Warriors Three
 * Einherjar
 * Numerous Asgardian Citizens
 * Skurge
 * Hela
 * Fenris
 * All Berserkers
 * Numerous Fire Demons and Fire Dragons

Trivia

 * In a noncanon video game, Loki declares that Thor will keep on defying Odin until the end of Ragnarok