Dav Pilkey takes readers back in time to the carefree days of kindergarten, when the worst thing George and Harold had to face was NOT evil mad scientists or alien cafeteria ladies but a sixth-grade bully named Kipper Krupp, the nephew of their clueless school principal. And because George and Harold don't actually invent Captain Underpants until fourth grade, the two clever kindergartners are on their own -- using their brains to beat the bully....

Jorge y Beto crean al mejor superhřoe de la historia de su escuela, y despuš, hacen que cobre vida.

"Prepare for plenty of giggles as a kindergarten class arrives for their first day of school, but can't find their teacher--only a delicious-looking sandwich and the words 'Mr. S' scribbled on the chalkboard. Chaos ensues as the kids argue whether or not the sandwich must be their teacher"--

Nuestros héroes han derrotado al Monstruo Mocobiónico, pero no han contado con los tres feroces Mocorobots. En esa aventura van a las regiones más profundas del espacio interplanetario y a través del tiempo al misterioso y desconocido mundo del anteayer.