Thor: The Dark World didn’t explore the importance of the Nexus of All Realities or Nexus Beings. Instead, the movie included the Nexus of All Realities as one of many Easter eggs on Erik Selvig’s chalkboard explanation of the multiverse. This is one of the earliest teases of the multiverse in the MCU, but it hasn’t been referenced since then, making the callback in WandaVision all the more noteworthy. The Nexus of All Realities is located in Florida in the comics and is protected by Man-Thing. It’s possible the Nexus’ location had been changed to Westview, New Jersey for the purposes of the MCU. Man-Thing was previously referenced as a Champion of Sakarr in Thor: Ragnarok too, so he might not yet be the guardian of the Nexus of All Realities in the MCU.
The reference to the Nexus of All Realities only adds another layer of intrigue to what will transpire during the final two episodes of WandaVision. This tease will likely be overshadowed with the confirmation that Agnes is Agatha Harkness and has been the villain the whole time, but the Nexus of All Realities could be tied to her evil plan or how she’ll be defeated. Maybe the Nexus will even be used to confirm Evan Peters’ Quicksilver is really the one from Fox’s X-Men movies. There are a lot of possibilities that come with a link to the multiverse, but it’s also great to see WandaVision building off established MCU canon in this way.
Originally from https://screenrant.com/mcu-wandavision-multiverse-nexus-explained/