Destroy the robotic Tyhrranoid Forces is an optional mission in Up Your Arsenal, taking place in Metropolis, Kerwan. After Dr. Nefarious transformed the tyhrranoids into robots, the robotic tyhrranoids had reinforcements all over Metropolis, and proved a considerable threat to the Galactic Rangers. Ratchet and Clank led the Ranger counterattack against them in another part of the city.
To complete this mission, all five missions in Operation: URBAN STORM must be completed. They can be completed at any time, though it is a good idea to complete them after defeating Giant Klunk for bolts. After this, return to the Phoenix for the next mission, "Explore the Crash Site".