premise: Psych's protagonist is not played by an American actor.
hypothesis: Psych . The program also stars Dulé Hill as Shawn 's best friend and reluctant partner Burton `` Gus '' Guster , as well as Corbin Bernsen as Shawn 's father , Henry , a former officer of the Santa Barbara Police Department . Shawn Spencer is a fictional character and the main protagonist on the American television drama and comedy Psych played by American actor James Roday .