3 sagas set in 3 different worlds...

The Tiberium Saga

The Tiberium saga forms the backbone of Command & Conquer: the story of a Earth transformed by an alien crystal and the never-ending war between the Global Defence Initiative (GDI) and the Brotherhood of Nod, led through the centuries by the messianic and immortal Kane.

The Tiberian Dawn

First War (Tiberian Dawn, 1995), the Tiberium meteorite and the rise of Nod;
Second War (Tiberian Sun, 1999), the return of Kane, The Forgotten and a world in flux;
Firestorm War (Firestorm), the CABAL AI turns against its creators;
Third War (Tiberium Wars, 2007), the destruction of Philadelphia and the arrival of the Scrin;
The Ascension (Kane’s Wrath, 2008), twenty years of the Brotherhood’s intrigues;
Twilight (Tiberium Twilight, 2010), the Tiberium Control Network and the end of Kane’s journey.

The Red Alert saga

The Red Alert saga arose from a temporal paradox: by eliminating Hitler, Einstein handed Europe over to Stalin. This alternate history gave rise to three alternative world wars, impossible technologies (Chronosphere, Tesla, mind control) and some of the series’ most iconic characters: Tanya, Yuri, the First Romanov and Emperor Yoshiro.

The games in the series

Red Alert (1996) and its expansions Counterstrike & The Aftermath;
Red Alert 2 (2000) and Yuri's Revenge(2001);
Red Alert 3 (2008) and Uprising(2009).

The Generals Series

Generals is the ‘realistic’ universe of Command & Conquer: no Tiberium or time travel, but a geopolitical war set in the near future between the United States, China and the terrorist organisation GLA.

Games in the series

Command & Conquer: Generals(2003);
The Zero Hour expansion(2003);
Generals 2, cancelled in 2013; see Cancelled Projects.