Flora starts moulting and is so embarrassed by her grey stubble that she goes into hiding. Unable to persuade her to come to the zoo, Ziggy transforms the tram into a fanboat to get them across the lake. The resulting wind prompts him to make a feather boa so Flora can cover up. Flora loves it.

Lionel always likes to look smart, so when an accident with Scottie’s packed lunch makes a mess of his safari suit, it’s a major crisis. Miss Emily is able to dry clean the suit, and Ziggy transforms the tram into a bi-plane to get them to the zoo on time.

Miss Emily wants to visit the jungle to see the ‘Empress Emily’, a rare exotic vine named after her by a friendly zoo visitor. Shackleton takes fright at a spider and gets lost in the trees. And by the time he’s found, it’s time to go – without having seen the Empress.

Tony wants his friends to do a concert for his dad, but he insists on such lengthy rehearsals that by the time they arrive at his dad’s tree, it’s too late. Tony is devastated to miss seeing his dad.

Bunbury plans a modest celebration to mark the 100th journey of the tram, but for reasons he can’t fathom, his friends don’t want to join in. Unbeknown to him, they have something bigger in mind: a surprise party.

Brian has a cold and wants to stay home in bed, but Miss Emily insists that a mug of her special Hot Lemon Drink will cure him. However, when collecting the lemons causes the tram’s batteries go flat, it takes Brian and a turbine – Ziggy’s latest invention – to generate enough energy to get them to the zoo on time.