Thi-Sen is the chieftan of a peaceful tribe of Talz on the planet Orto Plutonia. He tried to negotiate peace with the Pantorans and Galactic Republic, but Chi Cho, chairman of the Pantoran Assembly fought against the peace they found. With Chi Cho out of the way, Riyo Chuchi, with the aid of C-3P0 is able to make peace with Thi-Sen.