The enigmatic Skull Stone has fragments dispersed throughout the world. Its reassembly will unveil the whereabouts of Earth's biggest gold repository. On the chase for the Skull Stone are the nefarious Doronbo Gang. Opposing them are Gan and Ai who become Yatterman-1 and Yatterman-2, the masked heroes. Accompanying them on their expeditions is Yatterwan, a capacious robotic mutt.