Phil Diffy is the eponymous 14-year-old Phil of the Future, who became trapped in the year 2003. He went to a present-day school called H.G. Wells Junior and Senior High School and befriended a girl named Keely Teslow. His family includes his sister Pim Diffy, his mother Barbara Diffy, his dad Lloyd Diffy, and his great-great grandfather Kyle Speckle.