Scooby-Doo! Mecha Mutt Menace

The gang visits a Science Expo in Houston, Texas, only to find that another mystery is waiting for them. It seems that a giant robot dog named Mecha Mutt has come to life, and legend has it that the Science Expo is haunted by a "Space Specter." The gang, along with their new friend Melanie Staples, investigates the mystery of the Mecha Mutt menace and tries to stop the robot canine before he strikes again! (imdb)