Martian Madness

Martian Madness is an event that was added in the 1.3 update. The event was announced by Cenx in the April Fools' spoiler. It includes several alien-themed enemies, among them the Brain Scrambler, Gigazapper, Gray Grunt, Martian Engineer, Martian Officer, Ray Gunner, Tesla Turret, and Martian Walker. The event also includes an extremely difficult boss, the Flying Saucer. The event also adds the Martian Conduit Plating, and two vanity sets, Martian Costume, and Martian Uniform. This event can be triggered after the Golem has been defeated: Somewhere on the surface Martian scanning-probes will appear. If the player happens to find one, and gets to close to it, it will emit a red light and fly off. The summoning message "Martians are invading!" will appear.

The 1.3 music spoiler track plays during this event. (listen)