Before rising to fame for his starring role as Ernie Cooper on the Disney Channel series K.C. Undercover, McFadden appeared as Bumpty in the 2013 film Grown Ups 2 and contributed voice acting work to the 2012 animated feature Rise of the Guardians. He began acting at the age of six and, at the age of eight, attended professional auditions for the Youth Ensemble of Atlanta's theatrical season.
