Doctor Strange might be responsible for Kang’s arrival in the Marvel Cinematic Universe, but not because of his actions in Doctor Strange in the Multiverse of Madness. The introduction of Kang the Conqueror in Phase 4 meant that the multiverse needed to be restored. Loki featured the Sacred Timeline breaking as part of He Who Remains’ plan, but theories continued to swirl about what event in particular led to the recreation of the multiverse. It was commonly thought Doctor Strange 2 would provide the answer and continue to set up Kang as the Multiverse Saga’s villain, but that did not come. It is possible that Doctor Strange’s actions before the sequel are actually what lead to Kang’s arrival. In 2016’s Doctor Strange, the arrogant sorcerer manipulates the natural laws of nature to stop Kaecilius and Dormammu’s invasion.
While it was a heroic moment for Doctor Strange, the movie ended with Mordo teasing that there will be massive repercussions for these actions. Audiences have since interpreted the line to be a tease of Thanos’ actions in Avengers: Infinity War or even Mordo’s quest to eliminate sorcerers. However, it might be that Kang the Conqueror’s arrival is the true fallout of Doctor Strange’s actions.