The eldest of the chrononauts and Cozi’s stepsister-to-be, Rachael is a serious, intelligent and kind 14-year old girl from the 21st century. Whether conducting a science experiment or acing exams, she’s always focused on the task at hand. A self-proclaimed “teacup biologist,” Rachael will take the science lab over the great outdoors anyday. It’s a shame they didn’t have science labs back in dinosaur times!