|2 Season, Episode 129|
|written by'||Craig Barlett|
Dinosaur Train Submarine: Maisie Mosasaurus is the 129th episode 2nd season of Dinosaur train.
The Pteranodon family goes back underwater in the Dinosaur Train Submarine and meet Maisie and Marvin Mosasaurus, a daughter and father who are huge, fast-swimming lizards with flippers. Maisie and Shiny bond when they discover neither likes to go down deep in the water.
- Western Interior Seaway
- Cretaceous Period