The team are building Sunflower Valley's first geodesic dome. As Wendy has organised the dome and knows how it all fits together, Bob suggests that she might like to take charge of the job. Reluctantly Wendy agrees. The machines wonder why Wendy is acting so strangely and when Bob's out of earshot, she reveals that she's organised a surprise party for Bob. It's to be the following night at the dome. Mr Bentley is inviting everyone from Bobsville and there's a lot to get ready - and now she has to build the dome too! Mr and Mrs Bentley arrive early - partly to pick a spot for their new house, but also to help with preparations for the party. When Mr Bentley lets slip that he's told everyone the party is tonight, Wendy panics. Mr Bentley offers to help, but Wendy decides it would be best if she handled everything from now on. Back at the building site, Bob and Wendy make a start putting the dome together, when Wendy hears from Scrambler that Mr Bentley has started to organise the party food. Wendy rushes off to stop Mr Bentley, leaving Bob on his own! Just as Wendy stops Mr Bentley, the residents of Bobsville arrive in Travis's trailer. More stress for Wendy as she realises that now she has something else to organise. Suddenly Muck turns up and tells Wendy that things have gone a bit wrong with the dome - she needs to be there all the time! Wendy realises that she can't do everything herself and finally allows Mr Bentley to help organise the party, while she handles the dome. The party is a big success and Bob is thrilled! They all agree that Sunflower Valley is shaping up very nicely indeed!