Dinobusters: When his friends come over, Trek tells them the story of a haunted house, which turns out to not have ghosts, but sure has dinosaurs! Who ya gonna call? Dinobusters! -- Show and dino: Trek forgets to bring something for show and tell -- Paws and claws: When Doug buries Mom's police badge in the backyard, Trek learns that the Therizinosaurus used its claws for defense, stripping leaves off trees and (coincidentally) for digging up roots. Luckily, the Therizinosaurus helps Trek dig up Mom's badge -- Survival of the biggest: While Penelope's home sick, Trek investigates why herbivores like the Dracorex, Euoplocephalus or the Brachiosaurus stick together in a giant migrating herd -- Dino rocks: Trek is surprised to see a psittacosaurus munching on rocks -- Flashy dinos: On Friendship Day, Trek watches an Amargasaurus showing off for another Amargasaurus and tries to figure out what's going on between the two -- Carnivore contest: At an indoor Go-Kart Track, the kids learn about dinosaur speeds when Trek tells a story about kids in go-karts who raced dinosaurs.