for other uses, see Dinosaurs
- After a rendition of the "Welcome Song," Nina tells her Sproutlet friends that tonight's adventure is all about dinosaurs, leading to Star pretending to be a "Star-o-saur," complete with some "stomping." Nina tells him that dinosaurs were big creatures that lived a long time ago, and that the biggest was the Argentinosaurus, which was as long as three buses, while the Nanosaurus was the size of a dog, prompting Star to add that the "Star-o-saurus" was as big as him. Nina explains that the word "dinosaur" came from the Greek versions of "terrible" and "lizard" and the fact that they were big and fearsome. She also adds that the Spanish word for dinosaur is dinosaurio, which she invites Star and the Sproutlets to say with her.
- Nina and Star see Lucy making a shovel and a fossil of a triceratops through the Sprout-o-scope.
- For tonight's Sprout stretch, Nina and her Sproutlet friends (including Bronx Murray) pretend to be dinosaurs, seeing how tall they are by standing on their tiptoes.
- For tonight's Goodnight Game, Nina and Star play a dinosaur memory game, in which they have to remember where the matches were. The duo matches a triceratops, pterodactyl, and tyrannosaurus rex, while the former explains what those dinosaurs were.
- Star tells Nina that he's a "Star-o-saur," which he coins as the shiniest dinosaur that ever lived.
- In the Star Talks segment, Star and his Sproutlet friends discuss their favorite dinosaurs.
- Nina shows the Sproutlets how to sign "dinosaur."
- Now wearing a costume, the "Star-o-saur" welcomes back the Sproutlets, Nina explains what she and Star have been discussing tonight and that the word for dinosaur in Spanish is dinosaurio. Star then asks Nina if dinosaurs go to sleep. Nina explains that, since dinosaurs haven't been around for years, they can only guess that they did and that they can tell what dinosaurs looked like judging from bones and fossils. She then explains that people who study dinosaurs are known as paleontologists, which she helps Star pronounce. Paleontologists dig up dinosaur bones they found and put them together like a giant puzzle, and Star suggests they do the same, but Nina tells him that it's time for bed, and suggests they see how their Sproutlet friends at home brush their teeth and wash their faces, leading to "Ready for Bed." Afterwards, Nina tells Star, still pretending to stomp, that they've had a great adventure, but now it's time for the "Star-o-saur" to go to sleep, which he finally does.