Talk:Martian Madness/@comment-26282647-20150922141654/@comment-26882764-20150922143125

The event won't occur if the Lunar Event has been started. You have to clear the pillars and defeat/die against the Moon Lord first.

Additionally, the event will only start if you are detected but do not destroy the probe, AND you do not follow the probe to the top of the Space layer (due to a bug).