Parker, Angus, and Russell become obsessed with doing challenges.
When Parker receives a package for the first time, the cloud decides not to open it.
Parker, Russell, and Angus make a new friend.
Lily tells the audience the Top Things to Do on Mt. Middlemost.
When a reformed raincloud teams up with a shipwrecked sea-postman and a magic walrus, the three form the Middlemost Post — the wackiest and most loveable postal service on Mt. Middlemost.