Terminator Endoskeletons T-850 and T-X

An endoskeleton is the internal support structure of an animal, human, or cyborg, for who is referred as an "Endo".[1][2]

For years, Skynet tried to imitate the human body in structure, functionality and looks on its robots so that it could build a perfect Infiltrator.

Skynet's most popular endoskeletal cyborg was its Series 800 Terminator, which used a metallic endoskeleton covered with living tissue. The Series 800 Terminator was a breakthrough in developing Terminators that were similar to humans.


Originally, Terminators were purely robotic and weren't covered with living tissue. Starting with the T-600, Skynet tried to cover the titanium alloy endoskeleton with rubber, which looked fake and was easy to spot. Skynet discovered a method that allowed them to grow living tissue over the endoskeleton, making the new Terminators almost impossible to spot.

Later and more advanced endoskeletons were manufactured with an alloy containing half a percentage of coltan.[3][4] Skynet also found out it was extremely difficult to send pure metal back in time by using time displacement equipment, but was able to overcome this by covering the Terminators with living tissue or mimetic polyalloy.

Skynet has experimented with Terminator models that don't have endoskeletons, such as the T-1000, which was made entirely of mimetic polyalloy, allowing it much more flexibility of motion.

Skynet combined an endoskeleton with mimetic polyalloy outer sheath in the T-X Terminator. Its advanced endoskeleton allowed the T-X to be fitted with onboard weapons systems — the first Infiltrator class to house advanced weaponry — each located within a reconfigurable arm, underneath the mimetic polyalloy outer sheath. Within its vast internal arsenal, the T-X possessed many different weapons and tools for different missions.

Known endoskeleton series


  • The opposite of an endoskeleton is called an "exoskeleton", an external skeleton built on the outside to protect the body. Any armor is also considered an exoskeleton, like full-body armor or the likes of natural armor used by several arthropods, such as insects and spiders.


  1. The Terminator: Dawn of Fate
  2. Terminator Genisys: Revolution
  3. "Coltan alloys have a much higher melting point." as Cameron told John. "Heavy Metal"
  4. "The Good Wound"

See also

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