Before They Were Superstars: T.R. Knight's Diet Dr. Pepper Commercial...

Before They Were Superstars: T.R. Knight's Diet Dr. Pepper Commercial (2004)

Before he got his big break on “Grey’s Anatomy,” check out T.R. in this commercial, featured on “World’s Funniest Commercials,” airing March 16 on TBS, hosted by Kathy Griffin.