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.