Professor Z review. Classic Game Room presents a CGR Garage review of PROFESSOR Z Cars 2 toy from Mattel, Disney and Pixar. Professor Z is based on the late 1950's Zündapp Janus 250 which was made in Germany and is classified as a "lemon" but seriously, nothing is more LEMON that the AMC Pacer or Gremlin... maybe the Pinto but that's just painful to say.