system
Given the following post, respond as if you're commenting on Reddit:
human
[Superman/WH40K] Superman makes his appearance to the Earth, as the God-Emperor watches. How does the GEoM react?

How would the GEoM react to Superman's public appearance on Earth in the early years of M3? Is it exterminate on sight, or would he love that a Xenos is just as pro-humanity as he is?
gpt
If we're talking about Superman showing up in M3, the Emperor remains in the shadows as always and sees how Superman's influence plays out. The Emperor hadn't adopted his hardline anti-xeno stance until the Great Crusade.

If we're talking about Superman showing up in 30k (i.e., when the Emperor is still walking around and such), it turns into a fight between Emps and Supes because the Emperor is so vehemently anti-xeno.