En Dwi Gast is the ruler of Sakaar who has a fascination with gaming and enjoys manipulating lesser life-forms. Becoming stranded on the planet, he fashioned himself into the flamboyant Grandmaster, establishing a dictatorship over its citizens and keeping them distracted with a series of battles among some of his strongest slaves called the Contest of Champions. When Grandmaster took Thor as his new contender, he was soon horrified to learn that Thor already knew his current champion, Hulk. As Grandmaster feared, Thor soon escaped Sakaar with Hulk, resulting in a new uprising which resulted in him losing his position over the people of Sakaar.