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When it reaches 100%, the event ends and Martian enemies stop spawning. This bar fills as event enemies are defeated. As with other invasion-style events, a progress bar is shown in the bottom right corner while the event is ongoing.
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Once triggered, the status message " Martians are invading!" appears, and UFOs start flying in the background (as seen in the banner above) though Martian Madness enemies will not actually begin spawning until the player is located near the default spawn point or near an NPC with valid housing. This requires at least one player with at least 200 maximum health to be in the world – otherwise, the event will not start. When this small flying enemy detects a player or is attacked, it immediately attempts to fly away. Martian Madness is triggered by a Martian Probe, which spawns randomly in the two outer lateral thirds of the map (with a higher spawn chance in the Space layer). It can only be triggered after Golem has been defeated.
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Martian Madness is a Hardmode, invasion-style event that includes several alien-themed enemies. If the Probe is able to escape after detecting the player, the event begins. The Martian Probe before spotting the player (left) and after (right).
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