Intruder is a dragon-like creature that resides in the Ratis star.

Intruder has made several appearances in the Gradius series and set the tradition of fire elemental creatures appearing as bosses, such as Phoenix and Volleone. It is also one of the few bosses in the series to get its own theme music, a piece called "Fire Dragon" which plays during its reappearance in the Gradius II boss rush stage. Curiously, it appears as only a sub boss in the NES port of Life Force.

In the Japanese version of Life Force, Intruder, like the stage it's in, has been recolored blue.

Its weakpoint is its head.

Attack Pattern

Intruder will attempt to wrap himself round the player, occasionally breathing fire. In the original game, Intruder's movements are fairly jerky and stiff, owing to limited programming of the era, but later games refined the programming to give it more fluid snakelike movement. In some games, Intruder can physically crush the player with its body. Since it has relatively low health however this is somewhat unlikely.

In Gradius II, it gains a new ability - splitting into three at low health. This naturally greatly increases the difficulty of the boss, each head needing to be eliminated on their own.

Finally, in Gradius Gaiden, O.V.U.M. uses the image of Intruder as scare tactics against the player.

Other Lifeforms

  • There are smaller fire dragons that reside in other stars, suggesting several stages in the life cycle of this creature. These range from the smaller, weaker Fire Dragons that reside in small scale suns, to the multiheaded Vulture Dragon.
  • Similar looking creatures are used as living weapons in the Core Warship Deltatry, perhaps even the same species. These particular dragons turn on their master upon his defeat, suggesting cruel treatment.


  • A spell called "Salamander" in Castlevania: Portrait Of Ruin summons an Intruder-like dragon that circles around its target, dealing massive fire damage.
  • In the Yu-Gi-Oh! card game, there is a monster similar to this one called Solar Flare Dragon.


See Also:

Ships Vic ViperLord BritishSabel Tiger (Iggy Rock) • Thrasher (Zowie Scott) • Super CobraGalaxyPurple EmperorRed Devil
Salamander stages Bionic GermMeteorite SpaceRatisVolcano AreaSalamander Planetoid
Salamander (MSX) stages Top Flight Speed to LatisConduct to Space Station ZotSet the Crush Blow System - Planet EioneusSet the Crush Blow System - Planet LaviniaSet the Crush Blow System - Planet KierkeWrath of VenomCrush Salamander
Life Force-only stages Organic Speed ZoneTemple Zone
Salamander 2 stages Organic SkyArtificial SunsResident EvilBattleship ArmadaRuins of Final BaseCrystal AsteroidsDoom Fortress
Salamander bosses Brain GolemTetranIntruderFortress ValisDeathBig Core X3Jumping MoaiZelos Force
Port exclusive bosses ZylomGauInvaderGigaTutankhamonDead EndEnigmaTrue VenomMetal SlaveZelos Barrier
Salamander 2 bosses BiterHydraAbadonTenny RopPlate CoreCerberusDoom
Gradius II
Ships Vic Viper
Stages (Arcade) Artificial SunAlienCrystalVolcanoRevenge of MoaiHigh Speed ZoneBoss RushGofer Ship Interior
Port-Exclusive Stages Volcano - Crystal (NES) • Enemy Base (NES) • Gofer's Lair (NES) • Temple (PC-E)
Bosses PhoenixBig EyeGiga (NES) • Crystal CoreDeath MK IIJumping MoaiBig MoaiDesert Core (PC Engine) • Big Core MK IIZub RushBig CoreTetranGauIntruderZelos Force (NES) • Covered CoreDemosCrabGofer
Organic Bosses
Space Entities NucleusIntruderInvaderPhoenix (Geezer Butler)GoliathBubble EyeWyvernVulture DragonBlizzard CrawlerChimeraGilladorVolleoneBiological OrganismLynyrd SkynyrdTriumph KicksGauGigaKiller Dwarf
Body Horror AbadonBrain GolemZylomBig EyeGregolMad SkinBrachion EyeBiterBerialHuge HeartCrawler (X) • Infected Statue
Plant Life Choking WeedStinger KidHunter FangGiga's RoseDendrodiumHans Naughty