So apparently in the finale, in an alternate reality, Ultron manages to wipe out all the Avengers (with the exception of Natasha who is sent to an Ultron bot world). He then manages to get all the Infinity Stones and he becomes very aware of the presence of The Watcher with the help of the mind stone. When that happens he finds out about the multiple timelines and he wants to conquer them all
It then forces The Watcher’s hand and he has to intervene to save the multiverse. He goes across the multiple timelines and forms his own multiverse Avengers which consist of the T’ Chalia Starlord, Captain Carter, Supreme Doctor Strange, Party Thor, King Killmonger, and Mad Titan Gamora. They all come together to join Black Widow to stop Ultron and save the multiverse.
Apparently the events in that episode will impact the entire MCU for future shows/movies
