Command & Conquer  2; Tiberian Sun

released January 1999

The true nature of Tiberium remains the greatest unsolved mystery of our global environment -- one that the world cannot afford to go unsolved as Tiberium-related illnesses infect a growing number of the earth's population.
Prolonged exposure to Tiberium results in a variety of Tiberium-related illnesses, similar to those caused by extreme radiation exposure. Many of the most heavily afflicted segments of the population cluster together in underground communities - calling themselves "The Forgotten."