Darth Mater is an exclusive, Die-cast car given away at a charity auction during Comic-con 2008. It is a solid Black version of the Tow Truck "Mater" from the Disney/Pixar movie "Cars" with a Cape and some of the most distinguishable features of Darth Vader's Helmet over it's grill. It also includes a Red glowing lightsaber coming out of one of it's tires. It was included in a case signed by George Lucas, as well as John Lasseter. The Case also had a button that would light up the stand, as well as spin the lightsbaer around, while playing the "Imperial March."
There is only one known in existence