In a distant galaxy, a young mechanic named Ratchet dreams of becoming a hero and joining the Galactic Rangers. His life changes when he meets Clank, a small, intelligent robot who crash-lands on his planet. Clank reveals a nefarious plot by the evil Chairman Drek to destroy planets for their resources. Despite initial skepticism from the Rangers, Ratchet convinces them to let him and Clank assist in the fight against Drek's forces.

As Ratchet and Clank train and prove their worth, they uncover deeper layers of Drek's plan, involving powerful weapons and dangerous allies. Their journey brings them closer as friends and heroes, highlighting themes of bravery, teamwork, and self-discovery. Ratchet must ultimately confront his own insecurities and rise to the occasion to protect the galaxy from impending doom.