The Pteranodon family travels to the “Classic in the Jurassic,” an Olympics type competition in which dinosaur teams representing the three Mesozoic time periods will compete in various contests. Today's competition is a race between turtle and theropod teams. When the fast theropods all get tangled up at the finish line, the race comes down to the slow moving turtles. It's an exciting race as the turtles are neck and neck! Who will win the race?

Buddy, Tiny and Mrs. Pteranodon are eating lunch at Pteranodon Terrace, and even though they've just eaten a big fish meal, Buddy's still hungry. Mum understands that because Buddy is a carnivore he needs meat.

It's time for the 'Classic in the Jurassic' - the Mesozoic Olympics. Today's "Air, Water and Land" contest is a three-part competition pitting teams consisting of a pterosaur and a crocodile from each Time Period against one another. Mrs. Pteranodon, Tiny and Shiny are recruited to help in one of the three "legs" of the race, while Buddy, Don and Dad watch from the stands.

Our Pteranodon family accompanies Mr. Conductor to the Troodon Town Roundhouse to meet up with Thurston Troodon, the Rocket Train's conductor. They all soon learn that Tricia Troodon, a young hotshot conductor, actually invited everyone there to see her new train - the Solar Train! The kids learn that it's powered by the sun! To test the train's performance, the three Conductors, along with the help of Buddy, Tiny, Shiny and Don, race the Dinosaur Train, Thurston's Rocket Train and Tricia's new Solar Train to the Triassic!

Buddy and Tiny give Elliot Enantiornithine, a first timer on the Dinosaur Train, a tour of the Train. When they go through Laura Giganotosaurus' car, she explains to them that today is her bird watching/drawing day, but she hasn't found a single bird to watch. But, there's Elliot. He hams it up for Laura, who watches and draws him. This is so fun that Buddy and Tiny bring Laura to meet another bird friend-- Arlene Archeopteryx. Then Arlene and Elliot introduce the kids and Laura to a new bird named Peng Protopteryx! It's a successful birdwatching/drawing day as all three birds are delighted to show off their unique feathers.

After Buddy, Tiny, Shiny and Don learn that it's Mr. Conductor's birthday, they decide to throw him a surprise party in his favorite place - the Dinosaur Train! The whole family plans the party, secretly riding the Rocket Train to pick up friends from all around the Mesozoic and gather ginkgo leaves for a special birthday cake. The party is a huge success - the Conductor is surprised and moved, and loves his tasty ginkgo leaf birthday cake.

As the Pteranodon kids play in their family nest, Buddy stares at a sky full of clouds and asks the group, "What are clouds?" Mr. Pteranodon and his neighbor, Mr. Lambeosaurus, have different opinions. As they all get on the Dinosaur Train, they consider whether clouds are made of water or whether they're just made of fluff. Tiny knows who would have the facts--Mr. Conductor! He explains that clouds are made of billions of tiny drops of water that are so light they float in the air. He also takes the group to Cloudy Point Station where the kids play a cloud-spotting game, identifying the three types of clouds they learned about: cirrus, stratus, and cumulus. In the end, a rainstorm certainly proves that clouds are made of water!

The Pteranodon kids are playing a game called "I'm the Biggest," which raises the question: how big is the biggest frog? Dad takes the kids on the Dinosaur Train to find the biggest frog ever, the legendary Beelzebufo.

The Pteranodon family rides the "Night Train" all the way back to the Jurassic Period to visit their nocturnal friend, Vlad Volaticotherium, who tells them that he wants to take them caving! Buddy, Tiny, Shiny and Don don't even know what caving is, but they are soon having a great time seeing all the beautiful stalactites and stalagmites that have formed inside the cave.

Tiny can't believe it when he finds out that his friend Cindy Cimolestes doesn't like fish, but she explains that she's a mammal and many mammals don't eat fish. Determined, Tiny sets out to find a mammal in the Mesozoic who likes fish, so she, Buddy, Cindy and Dad set out on a fishing trip where they run into Cassie Castrocauda, a Jurassic mammal that looks like a cross between a beaver, an otter and a platypus, who also happens to love fish!

One morning at the family nest, Don befriends a butterfly that he names Dan. Don, Buddy, Tiny and Shiny watch Dan and three of his "sibling" butterflies fly around until suddenly they disappear, leaving Dan all alone. Don feels for the separated butterfly and vows to re-unite him with his siblings. After Mom and Dad give a quick lesson about butterfly camouflage, Don leads his own siblings all around the nest area searching for Dan the Butterfly's lost "sisters and brother." The whole time, Don keeps an eye on Dan, who camouflages himself when any threat (birds or a frog) are nearby.

Buddy, Tiny, Shiny and Don are excited that Keira Chirostenotes gets to babysit them for the night while Mr. and Mrs. Pteranodon go out for a dinner on the Dinosaur Night Train. Keira shows the kids how a dead log's decomposition provides food and shelter for many living creatures. Meanwhile, Mr. and Mrs. Pteranodon are gleeful as they enjoy their date, exploring the Dinosaur Train's other compartments.

The Pteranodon kids are spending the day with Grandma and Grandpa Pteranodon! On the Dinosaur Train trip to their grandparents' place, Buddy, Tiny, Shiny and Don learn about sycamore trees. Grandma and Grandpa are excited to have a whole day with their grandkids and doubly-excited to do a special project with them.

The Pteranodon kids are riding the Dinosaur Train with friend and fellow pterosaur, Quincy Quetzalcoatlus. When they pass by a waterfall, Buddy comments on how big it is. Quincy's dad mentions a giant waterfall at the edge of the Western Interior Sea. Mr. Conductor gives a lesson about waterfalls and then suggests a unique and amazing way to view the giant falls - from above.