|Date of creation:||Unknown|
|Date of death:||2077|
|Cause of death:||Fusion of the Core (due to a nuclear explosion)|
|Expertise:||Systematic exploitation of planetary resources|
|Played by:||Melissa Leo|
The Tet is an enormous tetrahedral space station, 30 miles per side orbiting Earth that was originally thought to be inhabited by humans who were yet to travel to Saturn's moon of Titan. It was later revealed to be an alien artificial intelligence that invaded Earth, and wiped out most of human civilization in the year 2017.
In the year 2017, NASA's deep space and ESA's ESTRACK scanners detected the Tet near Saturn, and redirected the Odyssey spacecraft to investigate. After abducting astronauts Jack Harper and Victoria Olsen along with the cockpit of the Odyssey, shortly after the rest of the crew were ejected back to Earth, the Tet proceded to invade Earth. The Tet would first destroy the moon, causing devastating earthquakes and tsunamis. It then wiped out surviviors using an army of Harper and Olsen clones, which were created by the obtained DNA of the original astronauts.
Once humanity had been weakened to a miniscule underground resistance, the Tet began to convert Earth's oceans into fusion energy via gigantic ocean-borne power stations. These hydro-rigs were protected by security drones, which were maintained by repurposed clones of Harper and Olsen.
In the year 2077, the Tet continued to maintain dominance over resistance forces on Earth. However some time in this year, one of Harper's clones known as Tech 49 discovers his true origins, and proceeds to infiltrate and detonate a thermonuclear explosion inside the Tet, ultimately destroying it.
Very little is known about the Tet's origins. It presumably originated somewhere outside the solar system. According to Malcom Beech, the artificial intelligence feeds off of one planet after another for its resources, most likely for its own survival, as it was only interested in fusion energy during the harvesting of Earth. Should the Tet collectively (and not just the core AI within it) be an entity, it could be considered a compact mobile Jupiter Brain.
Due to the fact that it is not a biological entity, its creators are likely incredibly advanced. They may even be a civilization made up wholly of robots. Perhaps it may have even created itself.
In 2017, astronauts aboard the Odyssey spacecraft were redirected to investigate the Tet after it was discovered by NASA. During this encounter, the Tet most likely obtained footage and audio of communication between the Odyssey and Sally, the crew's mission director. The Tet then used this footage to develop a complex personality, adopting Sally's appearance and voice to communicate with maintenance clones it would later commision to protect the hydro-rigs.