Home of the Tyhrranoids, Tyhrranosis was a desert world covered with fortresses and deep valleys. It was also home to the Mother Tyhrranoid. The planet's location was unknown to the galactic community until Ratchet and Clank working for the Q-Force were able find coordinates to the planet. The goal of the invasion of Tyhrranosis was to put a halt to the Tyhrranoid war effort, as they were employed by Nefarious. Although the invasion was an apparent success, the Tyhrranoids did not stop harassing the galaxy. Supposedly all of the Tyhrranoids seen after this battle were off-world forces.