Zac Efron to star and produce “sexy thriller” Zac Efron has reportedly signed on to star in and executive produce an untitled thriller for Mandate Pictures. The project will see Efron reunited with his Hairspray screenwriter Leslie Dixon, who has been tapped to pen the script. Details about the plot are being kept under wraps, but the trade paper described the movie as a “sexy thriller”. The High School Musical star will executive produce alongside Nathan Kahane. No director or further production details have been announced yet.