Command & Conquer: Tiberian Sun and Firestorm

After Red Alert tells the story of the first instalment, Tiberian Sun continues it: The GDI wants to contain the proliferating Tiberium; Nod is experimenting with the green crystals to create super soldiers. There is war again, so you build bases again, harvest Tiberium again and fight battles again. The latter suffer from the shaky balance: Nod's artillery is clearly overpowered.