On a trip to the science center, JoJo was shocked to discover the time machine wasn't just an exhibit. Whoops--it actually works! JoJo and friends end up skipping throughout time--meeting icons of history like Japanese haiku legend Basho and playing ball with All-American Girls Professional Baseball League. But how can they ever get back to their correct time period? Can important scientists like Ada Lovelace or Katherine Johnson help JoJo and her friends? But first, can they also take a peek at some dinosaurs before they get home? Because . . . dinosaurs!!!!!