Fans are losing their minds over Patrick Stewart's appearance in the latest trailer for Doctor Strange in the Multiverse of Madness.
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It looks like the legendary thespian will finally return as the mutant telepath Charles Xavier/Professor X in this inter-dimensional blockbuster. His role in the film could very well herald the X-Men's long-awaited debut in the Marvel Cinematic Universe, which could have a massive impact on the franchise as a whole. Here's why.
In the trailer, Stewart's character was spotted talking to Strange while sitting with a shadowy organization that had taken the sorcerer into custody.

In the House of M comic, the Scarlet Witch infamously used her chaos magic to wipe out most of the world's mutants. Though these mutants weren't killed, Wanda had taken away all of their powers by simply uttering the phrase, "No more mutants."

The Professor X we saw in the trailer could've been from the reality that Wanda wiped out, and his knowledge of what she did to his fellow mutants could make her a threat in his eyes.

The trailer does hint at Wanda turning to the dark side, which could bring her into conflict with Professor X and the other members of the Illuminati.
