I am not terribly familiar with the Norse concept of Ragnarök, though I do know that it revolves around the end of the world and all sorts of unpleasantness (which according to Wikipedia doesn’t typically include really large lizard-like monsters).  I should mention that I found this trailer while I was searching for the trailer for Robert Downey Jr’s. The Judge, where he apparently tries to play a character that’s only a little bit like Tony Stark.

It’s strangely difficult to find.

Though Ragnarok looks almost Disney-like, till the intrepid explorers come upon a cave covered with human bones, that is.