Pat is taking Mr. Pringle and the school children on the mystery tour in the post bus.

A strange creature is on the loose all over Greendale. First it chewed up Pat's sandwiches, then Dorothy's carrots, then Granny Dryden's washing line, knocked over Miss Hubbard of her bike, then brakes Major Forbes flower pots and it makes a racket in the Village Church! Who can it be?

The Major Forbes prepares for a film show about his balloon flights across the world. When Pat arrives at Garner Hall, the Major asks Pat to climb onto the roof, untangle the string and cast him off into the sky. Unfortunately it sets off with Pat still clinging to the basket up and up and away!

Ted invents a new robot postman to help give Pat a rest. When it goes out for its test run and arrives at the Post Office, it scares Mrs Goggins. When it gets loaded with post, it causes havoc over Greendale. Pat and Ted follow after the robot in Pat's Post Bus.

Pat does some gardening before work. When he tries to remove a weed, he sprains his back and Sara calls Dr. Gilbertson in. Pat needs a day in bed so Sara offers to take the post instead. Everyone is surprised to see Sara delivering the post instead of Pat. Sara has also forgotten something.

Madness over Sam's new catalogue has taken over Greendale, meaning Pat has a lot more parcels than usual. Ted devises a motorised scooter to make Pat's job easier but it proves to be more trouble than it's worth.

Pat offers to paint the ceiling for Granny Dryden, but some paint spills down his trousers. Pat goes home to change and gets an odd pair of trousers and Sarah can't help laughing. During his rounds, everyone wonders why on Earth Pat is out doing his rounds in shorts.

The villagers prepare to enter a best village competition. Will Greendale win first prize - and where has Ted's lorry got to?

Pat finds a long string across the road and follows it to see where it leads. It leads to a tree where Katy and Tom's kite is stuck. Pat needs to find someone with a ladder, so he can rescue the kite.

The villagers prepare for a Greendale arts show. Ted lends Pat some clay but it makes a mess. Pat makes a clay sculpture model of Jess. When he is traveling to the art show, his van runs out of petrol. Sam lends him some more petrol but it soon runs out again.

A huge parcel arrives at the Post Office and it squashes Pat's glasses after he puts them down on the counter. Mrs Goggins lends Pat one of her old pairs of glasses. Pat still can't see properly, meaning he can't read or drive, so Ted offers to take him in his lorry.

Garner Hall is opening to the public, but Miss Hubbard is having trouble organising the story of the house when the diary of Granny Dryden's grandfather is lacking excitement. Ted is restoring the suit of armour and then decides try it on. But he then gets stuck inside and he can't see where he's going. He crashes about the hall, with Pat chasing after him. The chase soon brings up a big surprise for Miss Hubbard.

Mr Pringle has been teaching the children about volcanoes and earthquakes. The next day this makes Pat think about the holes in the road. While on his rounds, he gets diverted round in a big circle. P.C. Selby lets all traffic pass through Thompson Ground and Ted gets ready to mend the hole with tar.