Eddie Houseman, a Tracy Family friend, is left stranded on a cliff after a demolition operation goes wrong.
Eddie Houseman is a partner in the Gray-Houseman Construction Company which has taken on the difficult task of building a roadway through a tropical rain forest. When earth tremors start landslides, Houseman makes a desperate bid to save the project by taking volatile nutomic charges into the mountains to stop the slides, but a tremor sends his truck to the edge of a cliff. Precariously balanced, the Thunderbirds must approach with caution as a blast from their vertical rockets could send the truck over the edge.