In Command & Conquer 4: Tiberian Twilight war rages on between the Global Defense Initiative and the Brotherhood of Nod. As various stages through the game you will meet up with The Forgotten.
Global Defense Initiative
Originally the military arm of the United Nations, the Global Defense Initiative rose to prominence as an answer to Nod’s increasingly aggressive stance at the end of the 20th Century. Later, their focus widened to include stopping the spread of Tiberium. While GDI is resourceful and dependable under even the worst circumstances, they’ve been far more successful at the former task than the latter.
For over six decades, GDI held the line against Nod’s vicious attacks, and even confirmed Kane as KIA on at least two occasions. Tiberium, on the other hand, has proved far more difficult to eradicate. That is, until a very-much-alive Kane presented them with a solution.
Brotherhood of Nod
Rumoured to be an ancient and powerful cult, the Brotherhood of Nod revolves entirely around the will of Kane and his quest to “elevate” humanity. Existing in the shadows for decades — perhaps millennia — the Brotherhood made itself known just as Tiberium arrived on Earth and quickly gained followers by luring the poor and disenfranchised around the world with promises of “ascension.”
Their tactics are a blend of fast-strike guerilla warfare and wide-scale terrorism, fuelled by an eclectic mix of low-tech militias and high-tech fanatics. Kane’s truce with their former enemy has left many of his worshippers confused and angry … and open to new leadership.
Unfortunates warped by Tiberium poisoning, the Forgotten lack central governance and seem to be only loosely organized into tribal bands. They are, however, a persistent threat to the Tiberium Control Network and anyone who comes in contact with them. Although the majority of Forgotten distrust pure humans, their loyalty can be bought. As mercenaries, their services are invaluable in the more desolate areas of the world.