A Nightmare on Elm Street 4: The Dream Master – Deluxe Freddy Krueger Mask. Trick or Treat Studios and Warner Bros. Pictures are proud to present the officially licensed A Nightmare on Elm Street 4: The Dream Master – Deluxe Freddy Krueger Mask. Based on hundreds of screen and behind the scenes photographs, this is the ultimate Freddy Krueger Mask from Wes Craven’s, A Nightmare on Elm Street 4: The Dream Master. Every detail of Freddy, as played by the incredible Robert Englund is present in this mask.