Command & Conquer Tiberian Sun Firestorm is an expansion pack to Command & Conquer Tiberian Sun developed by Westwood and published by Electronic Arts. Firestorm follows the events as they unfolded in the GDI campaign of Tiberian Sun. With Nod fractured into feuding warlords following Kane's death, Anton Slavik is determined to keep Kane's ideology alive through the resurrection of Nod's highly advanced artificial intelligence, CABAL.

The Global Defense Initiative continues its ongoing campaign to stop the spread of Tiberium and its monstrous mutations by retrieving the extraterrestrial Tacitus device, and decides to take control of CABAL to help it decode the device. but CABAL goes rogue and attempts to conquer the world through the systematic assimilation of human populations into cyborg armies, forcing Nod and GDI to unite temporarily against it.