Avengers: Endgame - 10 Secrets We Just Learned From The Writers At Comic-Con
5. Thor Almost Fought A Serpent
As good as it turned out to be, there was always a chance that Thor's Infinity War subplot simply wouldn't have worked. Out of every story thread in the film, it's the one that feels the most detached from the primary plot about the Infinity Stones, so there was a risk that audiences might have found it uninteresting by comparison.
This in mind, it's not surprising that Thor's mission went through many iterations and tweaks before the filmmakers settled on the final version.
One of the most curious of these versions was detailed by Markus and McFeely at their panel. The duo revealed that, at one stage, Thor was going to fight a giant serpent in his quest to grab Stormbreaker, but this idea was scrapped because it felt too "adventure-related" and "insufficiently character-based."
The writers also stated that this early version of the Thor subplot "sucked rocks", and that nobody liked it. This led to them having to fly back to Burbank and frantically re-jig the whole thing.