The Pack are repairing the Lightning Tree in Maithwaite Forest when Max and Monty run into it. The tree is about to collapse, but can Jack, Alfie, Kelly and Oliver save it?
Buster feels left out when he does not have any jobs to do. However, Miss Jenny discovers mole hills on a field and calls Buster to flatten them out.
Kelly is blown over by strong winds which makes him nervous of working in windy conditions. Can he face up to his fear in order to save Isobella?
Nelson is tired of his job of always having to carry the other machines and dreams to be carried himself.
Max and Monty tease Buster about being slow and challenge him to a race.
Ned is disappointed when Oliver is given the chance to demolish buildings.
The Pack all argue about whose job is more important - including Patrick the Cement Mixer who ended up face-first in his own concrete.
Alfie is depressed when the other machines tease him for being small. However, he learns that being small can be very useful.
Byron the Bulldozer is tired of being ignored. He is later the centre of attention when he has to save Alfie.
Whilst digging the foundations for a new school, Oliver the Excavator unearths a dinosaur skeleton.
The machines run out of fuel, so Isobella is sent to pick up some more. She does not like getting dirty, but is forced to go through muddy paddocks.
Jack knocks over some roofing slate. When Ned is blamed for the accident, will Jack do the right thing and own up to save his friend?
Kelly tells a scary story about a one-eyed truck to the machines. Max and Monty tease everyone about it, but end up looking silly.
