Speed Buggy and the gang come across the hidden valley of Amazonia during their participation in the Himalaya 500. The hidden valley of Amazonia is a place where women rule and men are slaves. They are introduced to Queen Sheba who uses a mind-ruling device to take control of Tinker and Mark's minds. Debbie is made an Amazonian, but when she is made to do things their way she decides the ruling women are as oppressive as any male despots. She and Speed Buggy work to break Tinker, Mark and the native men from the mind ruler.
—Lara Cain