The experiences of a young boy traveling by stagecoach from Philadelphia to New York on the Old York Road reveal the joys and discomforts of this mode of transportation.
Martha and Helen decide to enter Wagstaff City's Go Green Go-Cart race, so they do some research and visit the junkyard to find what they need to build a solar-powered cart.
Siblings Grant and Christina embark on a journey westward aboard a covered wagon with their grandparents, Mimi and Papa, to follow the path of the Oregon Trail, but along the way, the family encounters a mystery amidst their adventure.
When David's little brother's wagon is stolen, the Sherlock Street gang jumps in to investigate. The only clues they have are a strange bike left nearby, a dry spot where the wagon was left, and a dry newspaper.