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.

Parker takes a new resident on a whirlwind tour around the mountain.

The gang faces warfare to deliver a letter to a house that never gets mail.

Patrick's anxiety rises when the cloud appears to the source of nightly thundering.

Angus accidentally throws Burt away.

Angus takes a day off, but Parker thinks it's permanent.

Angus agrees to compete against Mayor Peeve's new POSTBOT in a mail-off to save the Middlemost Post.

Parker's anxiety escalates when the cloud appears to be the source of loud nightly thundering plaguing the town.

After one of Lily's inventions goes haywire, she enlists Parker's help to get it back under control.

Angus loses his lucky beanie, which causes him to revert back to being a child.

Parker accidentally loses one of Russell's teeth and hurries to find a replacement before Angus finds out.

On Free Toast Day at the Middlemost Toast, Parker does whatever it takes to make sure Angus enjoys the holiday.