One day on a walk with his dad Charlie sees some boys and girls on the rooftop of the school saying goodbye as they release butterflies up into the sky. Charlie is amazed by all the butterflies flying around and wishes he could do something like that too. And when Charlie starts school next year he becomes a "butterfly scientist" as well and helps his teacher and classmates care for some teeny tiny caterpillars as they grow into butterflies and are released by Charlie and his class. "Bye Bye Butterflies!"