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; after Angus tells Parker and Russell to leave the house on his day off, Parker wrongly assumes 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 over thunder.

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's new friend turns out to be a Leprechaun in pursuit of gold; when Parker finds mysterious love letters written by Angus, the little nimbus goes all over town to find who they're meant for.