Harry is outside, playing in a mud puddle and getting really dirty. His Nana tells him it's time to take a bath, but he says he doesn't like baths because the soap gets in his eyes. Nana recommends a solution for this, but Harry decides he still doesn't want to take a bath and makes a break for it. He and the dinosaurs go to Dino World, where Harry decides to do his best to become the dirtiest, stinkest boy ever. The dinosaurs recommend he play in primordial ooze, but it isn't nearly stinky enough for him. He and the dinosaurs go on a safari through the stinkiest areas of Dino World, but when Harry wants to visit Stinky Swamp, the dinosaurs bail out. Then, Harry meets someone at Stinky Swamp who begins to change his opinion.

It's 9 P.M. and Harry is full of energy. His Mom warns him that he needs a good sleep because he has to get up early for a hike with Nana tomorrow. Harry, however, feels that he can stay up all night. He decides the perfect place for this is Dino World. Once there, he holds races and all sorts of other activities with the dinosaurs. Then, his alarm clock shows up and warns him how late it is. Harry dismisses the clock, saying that he doesn't need him, but when it gets to be around three hours before 6 A.M., Harry begins to realize that he needs sleep after all.

Harry is outside during at recess at his preschool. His friend Charlie has just told him that a boy named Colin Carlisle said that his dinosaurs aren't cool. Colin proceeds to show off a robotic dinosaur of his own --- the new Raging Rex 5000. Harry and Charlie are a bit in awe of this dinosaur and even Harry's own dinosaurs are a bit envious of this machine's seeming power. They get annoyed, however, when Harry decides he'll make a robotic dinosaur of his own, rather than show them at show-and-tell. Harry hops into Dino World and they reluctantly come along with him. Harry goes ahead with the creation of his own dinosaur, but finds he's created a monster.