Conversation so far:
What is Legion Quest?
Legion Quest is a six-part Marvel Comics crossover event involving the X-Men, published in 1994-1995. It was a prelude to the Age of Apocalypse extended storyline.
Was Legion's father happy?
What is the Age of Apocolypse?
The death of Xavier created a catastrophic alternate timeline, the Age of Apocalypse.
What is significant about these two things?
Does Legion survive?
By accidentally killing his father, the horrified Legion prevented his own birth and ceased to exist.
Are there any other characters?

Question: Who is that?
Self-contained rewrite: Who is that?