When a toy train is ruined, the crew sets out to learn more about the landforms that make up City Town so they can build a replica; AJ's new gadget switches everyone's powers.
When the ball pit starts to overflow, Odd Squad must stop headquarters from being destroyed; two of Ms. O's assistants accidentally find themselves on a mission.
On a trip to Barrel Cactus National Park, Nature Cat and his pals encounter Shelby, a very sad desert tortoise; as Daisy, Hal and Squeeks are having a blast making shadow puppets, Nature Cat sits in a tree.
While painting outdoors, Elinor and her class experiment with natural items that they find after they run out of paint; Elinor, Ari and Olive help Mrs. Hippo pick up litter.
Bug Scouts Elmo, Abby, and Cookie Monster want to help Artie the Ant carry a heavy crumb; they try pushing the crumb, but it's too heavy to move, so they try to break it into smaller pieces.
Mary Leaky helps Xavier develop a strategy for a difficult scavenger hunt -- slow down and look around; Alexander Hamilton helps Yadina realize that starting first grade is an exciting adventure.
Rosie and Javi learn how people did things before there was electricity after a storm causes a power outage; Rosie learns to use tools from nature during a family camping trip.
Daniel visits the post office and learns how letters are sorted and mailed, then sends a letter to Dad; Daniel and Dad Tiger surprise Mom with banana bread.
The history of the all Black army regiments, aka buffalo soldiers, formed after the Civil War and the roles they played in the settling of the American West.