Hulk is back in the 'Thor: Ragnarok' trailer, and he's never looked more smashing

It's the end of the world as we know it, and we feel ... pretty hyped, actually.
That's because while the new trailer for Thor: Ragnarok promises doom and destruction, it also promises a really good time. 
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Thor and Hulk, the two Avengers who sat out Captain America: Civil War, are reunited here in the furthest reaches of space, where they're forced to face off in a gladiatorial duel. Don't worry, though &ndash