Conversation so far:
What was giant killer?
Mysterio later became a "giant killer" by defeating large opponents such as Kevin Nash, Bam Bam Bigelow, and Scott Norton.
when was his unmasking?
In 1999, after the two factions of nWo reformed, they demanded that the LWO disband.

Question: what happened after that?
Self-contained rewrite: what happened after Rey Mysterio's unmasking?