For the first time in Project Runway history, eight former fan favorites and Project Runway superstars are returning to the catwalk to compete against one another in the two-hour special, Project Runway: All-Star Challenge. The spirited competition premieres Thursday, August 20, at 8PM ET/PT and will be followed by the highly anticipated premiere of the sixth season of”Project Runway at 10PM ET/PT and the debut of the all-new companion series, Models of the Runway, at 11PM ET/PT.