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General Information


Not even the depths of a Lovecraftian nightmare could spawn such as this indescribable creature. No comparison to any Earth animal exists, the environment that could produce such as this beyond imagination.

Armed with long tentacles the Tentaculat paralyses its victims then transmutes them into mindless things. These progeny can cause death on touch, even through armour.

The Tentaculat is the most fearsome alien yet encountered by X-Com.

Source: Terror From The Deep Ufopaedia

Tentaculat Autopsy
Dead Tentaculat

The autopsy reveals small cybernetic implants are lodged in the creature's large brain. The vision system is a complex combination of visible light and thermal imaging acquisition. Even in the inky depths of the ocean this monster can navigate with unerring accuracy. There are vestigial organs that seem to be the bare minimum for survival. Each creature has a small stomach with an external connector, it is logical to assume the being is fed by direct nutrient input by its masters.

Source: Terror From The Deep Ufopaedia
Time Units 99 - 146
Health 96
Energy 140 - 207
Reactions 90 - 122
Strength 100 - 124
Bravery 110
Firing Accuracy 20 - 81
Throwing Accuracy 50
MC Skill 0
MC Strength 100 - 124
Front Armour 18 - 54
Left Armour 12 - 30
Right Armour 12 - 30
Back Armour 7 - 18
Under Armour 2 - 6
Hidden Attributes
Melee Accuracy 80 - 118
Energy Recharge 40
Victory Points 25
Standing Height 22
Kneeling Height 18
Intelligence 8
Aggression 2
Other information
Armour category Tentaculat
Possible Ranks Terrorist
Unique Attributes Melee Attack, Can "Fly", Zombification

Tentaculats are a race of what can only be described as floating brains. While they possess no ranged weapons, their speed and special melee attack make them a prime cause of Aquanaut deaths.

They are encountered exclusively underwater, defending important Alien structures such as Alien Colonies or Artefact Sites. They are also known to act as watchdogs for some of the larger Alien Subs that have touched down on the seabed, such as the Dreadnought.

Tentaculats are armed with powerful beaks that can pierce many inches of thick armour, regardless of the material. With their spine-line appendages, a Tentaculat paralyses its victims and bites them to transmute them into mindless things by injecting a fast acting agent. In addition to the mind destroying effects, the Tentaculat's transmutation process accelerates rigor mortis and bloats the victim until it rips through and destroys any suit of armour being worn. The victim will wander mindlessly in a shuffle and try to strangle or strike any X-Com target it comes across with inhuman strength.

Even if one of the zombified victims is killed, somehow, a new Tentaculat bursts from the corpse - unless the killing blow is done with a phosphorous round. This appears to cause the incubating Tentaculat's growth process to fail.

Basically a flying Chryssalid with an unusual distribution of armour.

Tentaculat Ingame


Tentaculats are extremely dangerous, especially since they have the potential to transform your own Aquanauts into more Tentaculats. Some things to keep in mind when fighting them:

  • Unlike with Chryssalids, "flying" offers no protection against Tentaculats, which means many of the standard anti-Chryssalid tactics won't work.
  • Submersible Weapons Systems, especially Displacers, are highly resistant to their attacks and cannot be zombified.
  • Like Chryssalids, they can exhaust their Energy in prolonged battles, which will slow them down considerably.
  • Tentaculats are water-bound and are never found on land. X-Com Aquanauts do not have to suffer the same mass infestations as their predecessors had to whenever a Chryssalid was dropped into an urban area.
  • Always try to leave TUs unused so that your Aquanauts can reaction fire - even a glancing shot will sometimes cause the Tentaculat to retreat. You can also use Particle Disturbance Grenades to achieve a similar effect.
  • Later in the game you can use M.C.ed Aliens for scouting, so that the Tentaculats kill them instead of your Aquanauts (this will not result in zombification).
  • Try to make sure any fallen Tentaculats are truly dead by listening for the death scream or picking up the body to see if it is a corpse. If in doubt, throw a grenade on the body; it will automatically kill off any unconscious Aliens in the blast. If you do not want to destroy nearby equipment or unconscious aliens, revive the Tentaculat with a Medi-Kit and shoot it again.
  • Their Front Armour is rather strong, so try to attack them from the sides or rear for better damage.
  • Tentaculats are vulnerable to explosives. However, they also have a high amount of health, so don't count on a single Magna-Blast Grenade to reliably take out a Tentaculat.


  • Takes 0.8x damage from armour piercing attacks, 0.9x from Gauss attacks, 1.1x damage from Sonic, Stun and melee attacks and 1.5x damage from explosives.
  • It is found exclusively underwater, and is a fairly common terror unit in the mid- and late-game.
  • Due to their Bravery stat of 110 (equal to a SWS), Tentaculats never panic.

See Also

TFTD Badge Terror From The Deep
Aliens AquatoidGillmanLobster ManTasothMixed Crew
Terror Units Bio-DroneCalciniteDeep OneHallucinoidTentaculatZombieTrisceneXarquid
Data TFTD Alien StatsAlien Rank TFTD Damage Modifiers TFTD Alien Appearance Ratios • SWS/Terror Unit Innate Weapons