"Now I know what you're thinking, how did this happen? Well, it's a long story," Chris Hemsworth's hero says at the top of the clip, which shows Cate Blanchett's Hela, Goddess of Death, destroying Mjolnir.
From there, Thor is captured, gets a haircut and is forced to face off against Hulk (Mark Ruffalo) in a gladiator competition. Thor's gleeful reaction: "We know each other, he's a friend from work!"
"Thor: Ragnarok" hits theaters November 3, 2017. Read the full synopsis below:
In Marvel Studios' "Thor: Ragnarok," Thor is imprisoned on the other side of the universe without his mighty hammer and finds himself in a race against time to get back to Asgard to stop Ragnarok -- the destruction of his homeworld and the end of Asgardian civilization -- at the hands of an all-powerful new threat, the ruthless Hela. But first he must survive a deadly gladiatorial contest that pits him against his former ally and fellow Avenger -- the Incredible Hulk!