Sakaar is the homeworld of the Sakaarans where members of alien species from across the universe are stranded.[1]
History
Through the many wormholes in Sakaar's sky, garbage and beings from around the universe have ended up on the planet.
Sometime after the Battle of Sokovia, Bruce Banner somehow ended up on Sakaar, where he established a reputation as a popular and successful fighter.
A couple of years later, when the Asgardian Goddess Hela sends Thor to Sakaar, Banner is forced to fight his fellow Avenger.[1]
