Phineas and Ferb want to boost their literature skills, so they decide to write a never ending story. And to make it fun, instead of writing it, they act it out with the rest of their friends. But they weren't supposed to read a script or anything; they have to improvise everything they do. So basically, they just have to wing it and play along as the story goes. They also have to make it as random as possible and keep it going and going as much as possible, their goal is to keep it up forever (or until they get sick of it!) Meanwhile, Doofenshmirtz is trying to create an army of microscopic amoebas with his “You-will-obey-me-you-tiny-little-biological-single-celled-organisms-inator!”