Luke Hemsworth Cast in Dwayne Johnson's Young Rock Young Rock. According to Entertainment Weekly, Hemsworth will be appearing in the penultimate episode of the show's first season as Dennis Erickson, who was the University of Miami's head football coach when Johnson was a part of the team. "I really enjoyed stepping into the legendary shoes of Coach Dennis Erickson, and also working again with director Jeffery Walker," Hemsworth told EW. "It's a wonderfully written show about family and the strange journeys that make us who we are — and also the Dwayne Johnson!!!!" You can check out a still of Hemsworth in the role below: