I do think an introduction will be key, im not so sure a narration is necessary. Do folks really need to know what the forgettable realms are? I still dont know what the hell is going on in Guardians of the Galaxy setting. I know folks are going to say, "but the MCU set it up!" Well, what film exactly set up GotG? We get a sad story of Quill losing his mom, abducted by aliens, and then bam, we are in space. Nothing connects it but the magic stones and the characters showing up together several films later. Could stand all on its own without long narrations or explanations of any of the world in detail. Nothing else matters to anybody except the diehards of the comics.