A 3D platform video game and the third installment in the Ratchet & Clank series. The gameplay is similar to previous games in the series but introduces new features such as a new control system and more levels in the upgrade system for weapons. It follows Ratchet and Clank's adventure through a fictional universe to defeat a robotic villain, Dr. Nefarious, who intends to destroy all organic life. Characters such as Dr. Nefarious and Sasha, a Cazar starship captain who helps Ratchet throughout the game, are introduced, and a number of characters return from the original Ratchet & Clank.