Thor was taken through a tunnel and introduced by the Grandmaster. He begins to panic when the tunnel ends and he was jolted into a meeting with the Elder himself was an eccentric man in colorful clothing, with an assistant beside him.
Thor is reunited with Loki, who reveals that he has been on Sakaar for weeks. He distances himself from Thor so as to maintain favor with the Grandmaster. Thor was thrown into the slave quarters, where he met two of the slave gladiators - Korg, a Kronan, and Miek, an insect alien with knives for hands. Korg introduced himself, and talks to him about the revolution he tried to start, and the Grandmaster's champion. Before the fight, Loki who is revealed to be using an illusion when Thor throws rocks at him, he proposes he and Thor could rule side by side after he gains enough trust to take control of Sakaar, Thor rejects this offer and is angry at Loki. Towards the end of the discussion, Thor throws a liquor bottle at him to which Korg tries to get rid of him.
Loki and the Grandmaster arrived at the Sakaaran Arena to witness the fight. Thor entered the arena, putting on his helmet and picking up his weapons as he prepares to engage his contender. The Valkyrie watched the arena from her ship above.
The Grandmaster introduced Thor, and the audience begins to call out for their favorite combatant, the champion. As the Grandmaster turns to introducing his champion, his call is cut short as the combatant breaks into the arena, revealing himself to be the Hulk, alive after his disappearance two years prior, but angered, crazed, and ready to battle. Thor, overjoyed at seeing his former teammate, attempts to talk and negotiate with him, but makes the mistake of calling him "Banner". As he watches, Loki becomes nervous and uncomfortable after seeing the Hulk, following their last encounter after the Battle of New York. Refusing to acknowledge Thor, despite his pleas and attempts to make him calm down, Hulk fights against his former ally, smashing Thor into the arena wall before throwing his hammer at him, which narrowly misses Thor's head. However, Thor turns the tables with this, grabbing the hammer as Hulk charges at him again and smashes him across hard across the arena wall, much to the shock of the Grandmaster and spectators.
Thor tried Black Widow's calming technique on the Hulk, but it fails to work; Hulk smashes Thor around similarly to how he smashed Loki around in Avengers Tower, much to Loki's pleasure, gloating that now he knows how that feels. Frustrated at being unable to reach his former ally, Thor goes on the attack, hitting him several times with Hulk's hammer, destroying Hulk's battle axe in the process; however, this only further angers his opponent, who, after taking several more hits, disarms Thor and sends him flying across the arena before repeatedly hitting Thor's face into the floor.
Just as it looked like Thor was about to die, he suddenly had a vision of his father, causing his lightning powers to surge, and hits a surprised Hulk with a large bolt of lightning, sending him flying through the air. Thor continued to re-gain the upper hand, hitting Hulk with a lightning-powered punch, gaining the support of the spectators and the other gladiators, who were watching from their quarters. However, unwilling to see Hulk lose, since he is a fan favorite, the Grandmaster cheated and fixed the fight by activating the Control Disk on Thor's neck, incapacitating him. Hulk attacked Thor and left him unconscious.
After their fight, Thor woke up in Hulk's chamber. The two former allies had a conversation, and Thor kept pleading for Hulk's assistance, but Hulk refused to acknowledge their friendship, grumpily stating that Thor likes Banner better. He does, however, revealed the location of the Avengers' Quinjet, nearby on Sakaar. Despite Hulk knocking Thor unconscious, Thor insisted that he won the fight; he later recounts their fight to Bruce Banner after eventually forcing Hulk to revert back, saying he won easily, though Banner is not entirely convinced that this is true.