Scooby-Doo! Mecha Mutt Menace.Fred has entered the Science Expo in Houston, Texas with a monster trapping project involving magnets, a trampoline, and a sticky net. A girl accidentally gets caught in the trap but is quickly freed by Fred. She catches Fred's eye (much to Daphne's dismay) and identifies herself as Melanie Staples, daughter of NASA Scientist Ned Staples. The gang checks out her father's demonstration where he unveils a large robotic dog, "Mecha Mutt", equipped to travel over Mars terrain. Suddenly, Mecha Mutt goes rogue and starts firing lasers out at the audience. Security goes after the robot leaving a perplexed Dr. Staples to face anxious reporters who blame the malfunction on the "Space Specter". Melanie explains to the gang that the Space Specter is an old legend about a ship that lost control while piloting through some space mist. A spirit attached itself to the ship when it landed on Earth and now anytime something goes wrong at NASA, they blame the supposed specter. The group splits up to talk to the other two people who worked on Mecha Mutt besides Melanie's father. Fred, Daphne, and Melanie talk to Lab Assistant Irv, who has a desk covered in food wrappers and sticky hands. Irv claims to have no idea why the machine went crazy having done a diagnostic test on it just before the demonstration. He laments being too busy to date before the trio take leave. Velma, Shaggy, and Scooby encounter a large mechanical dog on their way to Dr. Devon Albright's office. They find out Dr. Albright was the original creator of the Mecha Mutt technology and she's bitter that the more famous Dr. Staples was put onto her project to raise more funds...