Bill, Jeff and Judy begin building rafts to help the human tribes reach New Valley. Going through a nearby jungle, the trio encounter a very unlikely sight: a wrecked US spaceship and its pilot, Ron Brent.

Bill and Jeff, realizing that most of their plane's fuel was used up fighting the flying monster, set out to locate a new supply. However, Nova becomes ill during the trip and Judy hurries to Ape City in a race against time to get a cure for Nova.