Terraria Wiki

  • Discussions are now available on the Terraria Wiki.
  • Miss the old Hydra Skin? Try out our Hydralize gadget! Visit the preferences page while logged in and turn on the gadget.


Terraria Wiki
PC versionConsole versionMobile versionOld Chinese versiontModLoader versiontModLoader 1
PC/Console/Mobile/Old Chinese/tModLoader/tModLoader 1.3-Legacy-Only Content: This information applies only to the PC, Console, Mobile, Old Chinese, tModLoader, and tModLoader Legacy versions of Terraria.
Martian Saucer Trophy"Martians are invading!"Martian Saucer Trophy
Martian Probe Martian Probe (alarmed)
The Martian Probe before spotting the player (left) and after (right). If the Probe is able to escape after detecting the player, the event begins.
Extra 10
Progress bar icon

Martian Madness is a Hardmode, post-Golem invasion-style event that includes several alien-themed enemies. It can only be triggered after Golem has been defeated.

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). When this small flying enemy detects a player or is attacked, it immediately attempts to fly away. If the Probe escapes, the event starts. This requires at least one player with at least 200 maximum health to be in the world – otherwise, the event will not start. A Martian Probe will not spawn if any of the 4 Celestial Pillars are active.

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. As with other invasion-style events, a progress bar is shown in the bottom right corner while the event is ongoing. This bar fills as event enemies are defeated. When it reaches 100%, the event ends and Martian enemies stop spawning.

Martian Madness currently features 11 exclusive enemies and one exclusive mini-boss (Martian Saucer), resulting in 11 different banners and one trophy.



  • A Martian Probe will not spawn if the Lunar Events are active, or if a Martian Madness event is already started, or if another Martian Probe is currently already present anywhere in the world.
  • After exiting a world during a Martian Madness event, the screen in the main menu will still have Martian probes flying around.
  • Playing in Expert Mode does not increase the drop rate of Martian Madness items, but it does increase the spawn rate of the Martian Probe.
  • It is possible to override Martian Madness with the Pumpkin Moon, Frost Moon, or other events.
  • Exiting the world just before the Probe despawns may prevent the event from occurring when it is re-entered.
  • Martian Saucers are much more common after 50% of the event has been completed.
  • The Martian Madness event can be useful for farming items with biome specific drop rates; such as pirate maps.
  • If your nearby NPC townsfolk are killed during the event, the event will pause and the progress bar will disappear. However, if you go somewehere else with additional townsfolk, the event will resume and the progress bar will reappear at the same level of completion as before.


Achievement Tin-Foil Hatter
Tin-Foil Hatter • Triumph over a martian invasion, when beings from out of this world come to scramble your brains and probe you in uncomfortable places.
Defeat the Martian Invasion for the first time.
Category: Slayer Slayer


For more elaborate strategies on defeating Martian Madness, including weapon and arena recommendations, see Guide:Martian Madness strategies.
  • Martian Madness is one of the more difficult events to have occur, due to the fact that its summoning requires a random spawn of a Martian Probe. However, with a proper spawn platform or via the use of a Floating Island towards the outer thirds of the map, it can be "summoned" more easily.
  • You must let the Martian Probe fly over top of you so it can scan you. The probe will then turn red and the event will be activated.
  • If the Martian Probe has detected a player, chasing it might cause it to despawn, thus care should be taken.
  • While most minions will not deliberately target the Martian Probe, some can still accidentally kill it before it has the chance to detect players and escape, preventing the event from triggering. Minions should be dismissed if the player is trying to cause an invasion to occur.
  • Since the Martian Saucers drop the most valuable loot out of all enemies, it is usually preferable to allow as many of them to spawn as possible. Moving to a small arena high enough above the ground makes it easier to ensure no ground-based enemies spawn, increasing the chance of a Saucer to spawn.
Martian Probe Portal Summon

Using portals quickly despawns regular invasion enemies in favor of Martian Saucers.

  • By using two portals or Teleporters placed about 1000 feet apart, it is possible to quickly despawn regular invasion enemies without progressing the event, giving Martian Saucer more chances to spawn.
  • The Magic Conch can be used to the same effect.
  • due to the laser targeting mechanics of the saucers, staying in one place for targeting and then quickly moving out of the way will result in taking little to no damage.
  • slamming the rockets into the ground with a dash might work if timed correctly and done at sufficient velocity.


  • Unlike most other enemies in Terraria, Martians have purple blood when killed rather than red.
  • Martian Madness is one of only two invasion-style events that cannot be manually started by the player, the other being Slime Rain.
  • The name of the event could be a cultural reference to a real-world American basketball event known colloquially as March Madness.