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According to our sources, after Thor catches on to Hela and Loki’s (still mysterious) plot that is going down in Asgard, Hela destroys Mjolnir, and banishes Thor from Asgard (which we covered here). Loki and Hela’s plan involves the major arc of the Marvel Universe, and just when it looks like Thor is about to put a stop to it, he gets banished — but not to any old planet. He ends up on a gladiatorial planet where his head is shaved and he’s forced to fight for his life. Let’s call this planet Sakaar, like it was in the comic books.

Thor knows that he has to get to some MacGuffin weapon object to defeat Hela and Loki (could this be the Infinity Gauntlet that Thanos is in possession of, or maybe an assemblage of Infinity Stones?) and he has to get off the planet. Thor runs through all of his alien opponents in gladiatorial combat, even without his trademark hammer. Finally, Thor has to face the current champion of the arena, and wouldn’t you know who that ends up being? The Hulk.

When we reconnect with Hulk in Thor: Ragnarok, he’s managed to avoid reverting back to the Banner state since we last saw him in the Quinjet in Avengers: Age of Ultron. Hulk in Hulk form is pretty much unkillable, so he survived the trip to Sakaar (however he got there). His “Banner” is starting to seep through into the Hulk persona, and because of the Hulk-Banner melding, Hulk actually remembers Thor and his relationship to him. That’s what starts the two on a Midnight Run to the MacGuffin that Thor desperately needs.