Imprisoned on the planet Sakaar without his hammer, the mighty demi-god Thor is forced to engage in a gladiatorial duel with his old friend Hulk, in order to return to his planet Asgard and stop the villainous Hela from destroying the Asgardian civilization.
Initially Charlize Theron was considered for the role of Hela.
Thor wields a mace in his fight with the Incredible Hulk. In the Marvel comics, this mace was used by Thor's ally, Hercules.
To prepare for her role as Hela, Cate Blanchett studied capoeira, a Brazilian martial art.
Cate Blanchett's youngest son Ignatius Martin Upton had acquired a cameo role in the film.
In the Marvel comics, Ragnarok is a robotic clone Thor, created by Tony Stark, Hank Pym and Reed Richards to assist in the Marvel "Civil War" event. The real Thor was dead during the war, and was displeased when he found out he had been impersonated upon his rebirth
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