While building a new parking lot, picnic area, and play area at The Beach, Bob and the machines tell Benny and Scrambler the story of how Bob and his dad Robert built the building yard in Bobsville, and how the machine crew we all know and love got together.

Wendy organises a surprise party for Bob, but she is left worrying about the preparations when he puts her in charge of building a new dome at the same time.

The team build a home for Marjorie, but Muck's decision to create a mud hut ends in disaster.

Dizzy tries to make amends when she gets into hot water with new factory manager Marjorie.

Scrambler takes Scruffty for a walk to keep him out of Bob's hair — but finds the excitable dog has plenty of energy to burn.

Spud overhears Bob and Farmer Pickles planning to build something new out of straw, and thinks he is going to be replaced.

Bob faces a race against time to get everything finished on the workshop and storerooms, as well as doing a job for Farmer Pickles, so Benny and Scrambler help to get the work done.

Scoop works very hard and makes himself so tired he falls asleep.

Roley makes friends with a bird and helps her find the right spot to build a nest.

Bob searches for Robert, who is preparing a surprise for Wendy at her new home in Sunflower Valley.

Bob's dad slows him down, making Bob wonder how they are going to get everything done in time, but there is more to worry about when the older man disappears at the recycling plant.

Scoop looks for someone to take over Wendy's job at the yard and Bob's dad is the one to do it.

Bob digs a well and Wendy brings the team radio headsets, which soon come in handy when Muck gets lost.

Lofty finds it hard to tell Bob that he wants a place in the new machine shelter.

Bob's crew are nervous as they start work on the Sunflower Valley project, but Muck claims not to be afraid. However, his confidence soon disappears when he and Spud get lost in the woods

Bob enters a competition to design a town, and decides to make his design as environmentally friendly as possible, only to discover, when he wins the contest, that the prize is the job of building it.