Ai lockdown0000
Intro None
Type Crusher = Giant Chaser

Soldier = Chaser

Spitter = Ranged Chaser

Signs of nearing Roaring, Shrieking, and Breathing
Origin Alien
Map(s) Any
Theme song Epic Battle Theme/Predator vs. Predalien
Partners Xenomorph Soldier duplicates, Xenomorph Spitter duplicates & Xenomorph Crusher
Stunnable? Crusher = No

Soldier = Yes

Spitter = Yes

The Xenomorph X121, better known just as Xenomorph (which literally translates to "unknown shape") or the Alien, are a group of bosses that appeared on Slender Fortress.


The Xenomorphs are a race of hostile extraterrestrials from the Alien franchise. While they prey upon humans like predators with their unmatchable speed, strength, and durability, their society is based off a caste system like a bee hive or ant's nest.

In Slender FortressEdit

Xenomorphs are bosses in boss pack 3. Xenomorphs are a group of alien bosses that work together to kill their victims. Only the two weaker ones can be stunned.

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