Thor’s sister Hela (Cate Blanchett) is the one to wreak havoc this time. Thor and Loki fall off the Bifrost trying to prevent Hela from entering Asgard and they end up on the same planet. This planet is ruled by “Grandmaster” (an amusing Jeff Goldblum) where he has a bit of Videodrome-type fights. There Thor meets an old pal.
The first task is to get off the thrash-planet and then of course to defeat Hela which succeeds in an unexpected way that gives an amusing twist to the actual Ragnarök theme.
There is another known Marvel character in the film: Dr. Strange.