The villain Drek has built a huge weapon that he can use to destroy entire planets which he does diligently. He has already destroyed several planets, the next target is already selected. The Galactic Rangers under the leadership of the cheeky showman Qwark want to put the Fiesling the craft and seek for reinforcement. Little Ratchet, who has always wanted to become a Galactic Ranger, applies with hope and is rejected.
But the night after, a spaceship crashes near Ratchet. He finds in it the little robot Clank, who managed to flee from Dreks big robot army. Clank tells of Drek’s plan to wipe out the Galactic Rangers with a surprise attack.