Andrew, Judy and Thudd have escaped the Big Bang only to find themselves stranded on baby Earth! The brand-new Earth is one big ocean of Iava. Asteroids and comets rain down from the sky. But while the kids are busy dodging fire, Uncle Al is stuck in the Ice Age. Somehow Andrew, Judy, and Thudd must fix their time machine and get to Uncle Al—before he becomes a sabertooth tiger’s dinner!