Premise: Sterling Knight (born March 5, 1989) is an American actor and musician. He is best known for playing the roles as Alex in "17 Again", Chad Dylan Cooper in Disney Channel Original Series "Sonny with a Chance" and its spinoff "So Random!", Zander Carlson in "Melissa & Joey", and Christopher Wilde in the Disney Channel Original Movie "Starstruck".
Hypothesis: Sterling Knight played more than 4 separate roles during his career.