Tei Tenga

Tei Tenga is a fictional moon or planet where Doom was originally supposed to take place during its first and third episodes, according to Tom Hall's preliminary design document for the game.

The celestial body is tidally locked and thus the same hemisphere always faces the star it orbits; therefore it does not have day and night cycles. Because of the synchronous rotation, it is divided into two sections, a continually bright hemisphere called the Lightside, and a complementary sunless hemisphere called the Darkside. The anomalies that are being studied are on Tei Tenga's magnetic poles.

The bases on Tei Tenga used to be so called 'glory posts', but at the time of the game the bases have fallen into disrepair due to lack of funds, partly due to UAC cost cutting and the lack of research progress. UAC is a military contractor and this explains the military presence at the bases.

Although it is initially referred to as the giant moon Tei Tenga, it is called a planet in a few other instances. If the celestial body is a planet, it can itself have no moons of substantial size, as these would make tidal lock with the sun an impossibility. The computer screens in the game, as well as the sky textures, indicate Tei Tenga has a brownish red hue. From this we can easily deduce Tei Tenga has a soil rich in oxides and iron.

According to Tom Hall's Doom Bible, the mining operations on Tei Tenga focused on what is only referred to as "Fire Dust", a volatile combustible mined from the celestial body's crust. No further details are given about the substance, and its chemical composition is unknown. The bases that monitor the two anomalies on Tei Tenga's poles were initially set up to research the substance; this research, and the money associated with it, is what had caused the bases to experience their 'glamour days'. At the time of the game, the researchers were focusing their efforts on scrutinizing the polar anomalies.

Tei Tenga does appear in the finished Doom games, although somewhat obscurely, being named in some of the computer console display textures. Additionally, some fan-made PWADs expand on the Tei Tenga concept.

The meaning may come from Chinese. In Spanish "Te tengo" means "I've got you".