As The Direct summarized, this planet is controlled by a group of superheroes called the Illuminati that include Reed Richards from the Fantastic Four, Captain Britain, and the overwhelmingly powerful Black Bolt from the Inhumans.

Strange and Chavez are captured by this group out of an apparent concern for the destruction they could wage on the planet.

As we can see, the X-Men leader is played by Patrick Stewart as in most other movie adaptations of the popular comics.

The only difference, however, is that he's more explicitly styled after the version of the character we saw in the '90s animated series.

In what was sure to be a crowd-pleasing moment, Professor X's entrance was scored by a brief and updated rendition of the iconic theme song to the animated series.

But while this moment appeared to herald an prospective MCU debut for the X-Men, it also contained a subtler Easter egg for a different project that has already been confirmed.

And unless you watch the movie on Disney+, there's almost no way to catch that hint.

According to Entertainment Weekly, this refers to an upcoming animated series that's expected to premiere in 2023 and will see our mutant heroes pick up right where they left off when the first series ended in 1997.

That's likely why it's called X-Men '97 and while there isn't much else that we know about the cartoon at this point, I suppose viewers of the Doctor Strange sequel now know what its theme song will sound like.

h/t: The Direct