So Dr. Strange 2 officially codified the MCU as 616, in reference to the mainstream comics being Earth-616, essentially stating that they exist in different multiverses.
People lost their minds, because apparently there has been some reference in the past to the idea that the MCU DOES exist in the same multiverse as the comics, and that in that multiverse, it is Earth-199999 (for simplicity's sake, I like to call this 1-quintuple-9, or 1Q9)
Simple question: Where has this been stated before? I assume it was in the comics, hence the placement of this thread.
EDIT: I just found out that the X-Men films are apparently supposed to take place on Earth 10005. Huh. Where is that mentioned? What other adaptations have gotten numbers, and where are those mentioned?