Sakaar is the home planet of the Sakaarans in Hulk and the Agents of S.M.A.S.H.. It was once under the rule of the Leader, until the Hulks led the slaves in a rebellion and exposed the Leader. Sakaar will appear in Thor: Ragnarok where Thor must defeat the Hulk in a gladiatorial duel in time to save Asgard from Hela and the coming Ragnarök.