Martian Saucer is a Terraria NPC. It shows up during this event: 
Martian Madness. It drops 10 items: 
Martian Saucer Relic, 
Cosmic Skateboard, 
Xenopopper and 7 more.
Bestiary entry
Rarity:
An advanced flying saucer from somewhere well beyond this world. The destruction from its weaponry is unimaginable.
- Invasions: Martian Madness
- Immune to:
352 buffs
A Nice Buff, 
Abigail, 
Accelerated Afflictions, 
Acid Venom, 
Alchemic Enhancement, 
Alien Skater, 
Ammo Box, 
Ammo Reservation, 
Archery, 
Baby Dinosaur, 
Baby Eater, 
Baby Face Monster, 
Baby Finch, 
Baby Grinch, 
Baby Hornet, 
Baby Imp, 
Baby Ogre, 
Baby Penguin, 
Baby Red Panda, 
Baby Skeletron Head, 
Baby Slime, 
Baby Snowman, 
Baby Truffle, 
Baby Werewolf, 
Ballista Panic!, 
Banner, 
Basilisk Mount, 
Battle, 
Bee Mount, 
Beetle Endurance, 
Beetle Endurance, 
Beetle Endurance, 
Beetle Might, 
Beetle Might, 
Beetle Might, 
Bernie, Betsy's Curse, 
Bewitched, 
Biome Sight, 
Black Cat, 
Blackout, 
Bleeding, 
Blessing of the Moon, 
Blood Butchered, 
Blue Chicken, 
Blue Roller Skates, 
Book Mount, 
Broken Armor, 
Builder, 
Bunny Mount, 
Burning, 
Calm, 
Cattiva, 
Caveling Gardener, 
Celled, 
Cenaxe, 
Cerebral Mindtrick, 
Chaos State, 
Chester, 
Chilled, 
Chillet, 
Chillet Ignis, 
Clairvoyance, 
Classic Roller Skates, 
Clay Bud, 
Companion Cube, 
Confused, 
Cozy Fire, 
Crate, 
Creative Shock, 
Crimson Heart, 
Curse of the Bat, 
Cursed, 
Cursed Inferno, 
Cursed Sapling, 
Cute Fishron Mount, 
Damage Nebula, 
Damage Nebula, 
Damage Nebula, 
Dangersense, 
Dark Horse Mount, 
Darkness, 
Daybroken, 
Dazed, 
Deadly Sphere, 
Desert Tiger, 
Destroyer-Lite, 
Digging Molecart, Distorted, 
Drill Mount, 
Dryad's Bane, Dryad's Blessing, 
Durendal's Blessing, 
Dynamite Kitten, 
Eater of Worms, 
Electrified, 
Enchanted Daggers, 
Endurance, 
Estee, 
Everscream Sapling, 
Exquisitely Stuffed, 
Eyeball Spring, 
Fairy, Fairy, Fairy, 
Fairy Princess, 
Fart Kart, 
Faun, 
Featherfall, 
Fennec Fox, 
Feral Bite, 
Fishing, 
Flamingo, 
Flickerwick, 
Flinx, 
Flipper, 
Forbidden Ruin, 
Form of the Fae, 
Foxparks, 
Friendly Boulder, 
Friendly Rainbow Boulder, 
Frostbite, 
Frostburn, 
Frozen, 
Gills, 
Glittery Butterfly, 
Glommer, 
Goat Mount, 
Golf Cart, 
Gravitation, 
Green Roller Skates, 
Happy!, 
Harvest Time, 
Heart Lamp, 
Heartreach, 
Hearty Meal, 
Hellfire, Hemorrhage, 
High Spirits, 
Hoardagron, 
Holy Protection, 
Honey, 
Honey Bee, 
Hornet, 
Horrified, 
Hungry, 
Hunter, 
Ice Barrier, 
Ice Queen, 
Ichor, 
Imp, 
Inferno, 
Instinct of the Raptor, 
Invisibility, 
Ironskin, 
Itsy Betsy, 
Jack 'O Lantern, 
Jungle's Fury, 
Junimo, 
Lava Shark Mount, 
Leaf Crystal, Life Drain, 
Life Nebula, 
Life Nebula, 
Life Nebula, 
Lifeforce, 
Lil' Harpy, 
Lovestruck, 
Lucky, 
Magic Lantern, 
Magic Power, 
Majestic Horse Mount, 
Mana Nebula, 
Mana Nebula, 
Mana Nebula, 
Mana Regeneration, 
Mana Sickness, 
Mana Surge, 
Merfolk, 
Midas, 
Mighty Wind, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Minecart, 
Mini Prime, 
Mining, 
Moon Bite, 
Moonling, 
Mushroom Boi!, 
Nature of the Rat, 
Night Owl, 
Obsidian Skin, 
Obstructed, Oiled, 
On Fire!, 
Oozed, 
Painted Horse Mount, 
Paladin's Shield, 
Panic!, 
Party Roller Skates, 
Peace Candle, 
Peckish, Penetrated, 
Pet Bunny, 
Pet Lizard, 
Pet Parrot, 
Pet Sapling, 
Pet Spider, 
Pet Turtle, 
Phantasmal Dragon, 
Pig, 
Pigron Mount, 
Pirate, 
Pirate Ship Mount, 
Plantera Seedling, 
Plantero, 
Plenty Satisfied, 
Pogo Stick Mount, 
Poisoned, Potent Acid, 
Potion Sickness, 
Propeller Gato, 
Pufferfish, 
Puppy, 
Pygmies, 
Rage, 
Rapid Healing, 
Ravens, 
Regeneration, 
Rez and Spaz, 
Rudolph, 
Sanguine Bat, 
Santank Mount, 
Scutlix Mount, 
Shadow Candle, 
Shadow Mimic, 
Shadow Orb, 
Shadowflame, 
Shark Pup, 
Sharknado, 
Sharpened, 
Shimmering, 
Shine, 
Silenced, 
Skeletron Jr., 
Slime, 
Slime Mount, 
Slime Prince, 
Slime Princess, 
Slime Royals, 
Slow, 
Solar Blaze, 
Solar Blaze, 
Solar Blaze, 
Sonar, 
Sparkle Slime, 
Spelunker, 
Spider, 
Spider Brain, 
Spiffo, 
Spored, 
Squashling, 
Star in a Bottle, 
Stardust Cell, 
Stardust Dragon, 
Stardust Guardian, 
Starving, 
Stinky, 
Stoned, 
Strategist, 
Striking Moment, 
Suffocation, 
Sugar Glider, 
Sugar Rush, 
Summoning, 
Suspicious Eye, 
Suspicious Looking Eye, 
Swarm Biter, 
Swiftness, 
Terra Fart Kart, 
Terraprisma, 
The Bast Defense, 
The Dirtiest Block, 
The Tongue, 
Thorns, 
Tiki Spirit, 
Tiny Deerclops, 
Tiny Fishron, 
Tipsy, 
Titan, 
Titanium Barrier, 
Torch Blessing, 
Toy Golem, 
Tree Mount, Trusty Cattiva, 
Trusty Chillet, 
Trusty Chillet Ignis, 
Trusty Foxparks, 
Turtle Mount, 
Twins, 
UFO, 
UFO Mount, 
Unicorn Mount, 
Vampire Frog, 
Volt Bunny, 
Warmth, 
Water Candle, 
Water Walking, 
Weak, 
Weapon Imbue: Confetti, 
Weapon Imbue: Cursed Flames, 
Weapon Imbue: Fire, 
Weapon Imbue: Gold, 
Weapon Imbue: Ichor, 
Weapon Imbue: Nanites, 
Weapon Imbue: Poison, 
Weapon Imbue: Potent Venom, 
Webbed, 
Well Fed, 
Werewolf, 
Wet, 
Whip Spider, 
Winged Slime Mount, 
Wisp, 
Witch's Broom, 
Withered Armor, 
Withered Weapon, 
Wrath, 
Zapped, 
Zapped, 
Zephyr Fish - Traits: Cannot be hurt; Moves through blocks
Attacks
| Classic | Expert | Master | Legendary |
|---|
| Touch damage | 50 | 100 | 150 | 266 |
|---|
Projectiles
| Projectile | Classic (range) | Expert (range) | Master (range) | Legendary (range) | Inflicts |
|---|
 Martian Deathray (from Variant 2) | 160 (136 to 184) | 320 (272 to 368) | 480 (408 to 552) | 480 (408 to 552) | |
Variant 1 Size 100%
Variant 2 Size 100%
Martian Saucer Cannon (from Variant 2), 
Martian Saucer Turret (from Variant 2)
Cosmic Car Key
Electrosphere Launcher
Influx Waver
Laser Machinegun
Xeno Staff
Martian Saucer Trophy
Arc Surge
