Willie and Dooley are on their way to interview a fire chief for their newspaper. They witness a gorilla escaping from a nearby zoo. Willie changes to Wonder Wheels to investigate. The gorilla is helping other animals escape too. Wonder Wheels lures the gorilla back to his cage with a banana and corrals the other animals as well.

Two alien scouts, Starnok and Orbito, are determining if Earth is fit for their people’s inhabitation. They see Willie drive by and want to capture a typical human specimen for their investigation. Willie changes to Wonder Wheels and causes the aliens much grief. The aliens judge earthlings too dangerous for conquest and leave.

Willie and Dooley go to a county fair to see a motocross race. Two crooks plan to steal money from a county fair and get away in motorcycles after blowing up the bridge behind them. Willie and Dooley witness the caper and Dooley gets captured. Wonder Wheels makes a miraculous jump across the blown out bridge. Dooley is saved and the crooks are behind bars.

Willie and Dooley are on their way to see Gray Ghost, the fastest race horse in the world. The horse is being stolen and Willie pursues the thief on Wonder Wheels. Wonder Wheels finally catches up to the crooks and Gray Ghost is saved.

Willie and Dooley are on their way to interview an archaeologist about an ancient city he discovered. Two crooks scare off the scientist using a mummy disguise so that they can steal the Emerald Eye. Willie sees the fleeing scientist and changes to Wonder Wheels to investigate. Wonder Wheels chases the criminals, who are finally stopped when Wonder Wheels empties a large hidden cache of emeralds onto the criminals.