During a visit from their friend Mikey Microraptor, the kids go looking for an even smaller dinosaur.

Tank Triceratops , who has 3 horns, wonders why Mayor Kosmoceratops has 15, and Protoceratops has only 1. The kids go on a quest to track down Ceratopsians with horns.

Shiny and her friend Annie disagree when Shiny gets scared while exploring a cave. Mom's and her friend Tilly tell the kids about the time Mom got too scared to complete one of their childhood adventures.

Mom, Tilly, Tiny, Shiny, and Annie visit the old neighborhood where they complete Mom and Tilly's unfinished adventure and meet Goldie Globidens.

The Conductor’s nephew Gilbert has been taking Conductor courses at the Troodon Academy, and has finally graduated to Cadet Conductor! The kids are thrilled – will Gilbert get his own Dinosaur Train to conduct?

Our kids want their own clubhouse, separate from the family nest. They try out several locations, but none of them are the right fit. Eventually, the kids build their own clubhouse using natural materials.

The Conductor and the kids are out digging in a favorite fossil spot. Buddy turns up something that the Conductor doesn’t recognize. They may have discovered a whole new Jurassic species!

Buddy gets the idea to travel to the Early Jurassic and meet their new discovery, a theropod they named "Buddysaurus." Unfortunately, there is no train to the home of the Buddysaurus, nor a train station! The Conductor decides to take them all to the Early Jurassic, and hike.

When Don is told he can’t dig any more holes around the nest, he complains that he needs his own day just for digging holes—a hole-iday! The kids make up an imaginary holiday just for Don.

The Pteranodon kids meet a new, small mammal friend, Adele Alphadon, and introduce her and their Big Pond friend, Cindy Cimolestes, to a new concept -- that not all Mesozoic creatures are dinosaurs. And that includes the Pteranodons! They live in a diverse world.

The kids meet an autistic dinosaur named Dennis Deinocheirus.