Tom, Astro, and T.J. are assigned to fly an old ship to Venusport, where it is to be scrapped. But as the Cadets are descending toward Venus, the ship's reactors malfunction, sending it crashing into the Venusian jungle, as the Cadets bail out to survive. Then they must work to survive again in the midst of a Venusian jungle, while all the time an unseen volcano threatens to erupt and they must use the survival techniques learned at the Academy.