They were called Tenno. Warriors of blade and gun – Masters of the Warframe armor. Those that survived the old war were left drifting among the ruins. Now they are needed once more. The Grineer, with their vast armies, are spreading throughout the solar system. A call echoes across the stars summoning the Tenno to an ancient place. They summon you. Come Tenno, you must join the war.
- Stick It To The Man