End of Time (Lost travelers)
From Chrono Compendium
Inquiry
Who are the other people that Gaspar refers to when he says that many people have been popping up around time?
Theories
Developer Reference
Chrono'99
Gaspar is simply talking about the programmers of the Developer's Ending in the game. It's an inside joke among the staff of Chrono Trigger.
Accidental Gate
ZeaLitY
Perhaps some people accidentally triggered Gates throughout the various eras.
From: Theory (Plot and Other)
