Scooby tries to impress a female pedigreed dog when she is dognapped. Scooby goes back to the gang and listens to a radio update on a rash of dognappings. They visit Buck Masters, who's dog is also dognapped, who thinks that the dognappings are related to an upcoming dog show. The gang turns Scooby into a decoy for Champion, another competitors prizewinning dog. It works until the dognappers grab Scooby. Shaggy uses a scooter to catch up with the dognappers, but loses their trail when he is menaced by a ghostly indian on horseback.
Meanwhile the dognappers ringleader, notices that Scooby is not Miller's Great Dane, and sends on a railroad car down the train tracks on the mountain. The gang following Scooby's tracking device on his collar, hooks up with Shaggy and finds Scooby that is rolling down the track. Shaggy jumps onto the railroad car, and reverses the car, just ahead on The Midnight Express. Scooby leads them back to where he was taken when the gang is menaced by a ghostly indian on horseback. They go up to an abandoned indian village, where they are menaced by the indian witchdoctor and warns them to leave. However, the gang does not heed the witchdoctors warning and they still go on. Fred and Daphne once again meet the witchdoctor. Fred goes to investigate the stone idol in front of which the witchdoctor had been standing, when Daphne vanishes. Scooby separates from Shaggy and Velma and finds Daphne tied up. Scooby unties Daphne, frees the dogs, who corner the witchdoctor. He is unmasked as Buck masters, who was kidnapping dogs who could beat his dog and then he would turn up just before the show and win first prize