Mitchell's favourite games are playing at being a lion and with his toy cars. Mitchell takes his three favourite cars, including a new powerful purple Porsche, on a family visit to the zoo. He is keen to show his cars to the lions.
The story gets exciting when one of the lions escapes and takes an interest in Mitchell's cars. Mitchell plays an important part in helping the zoo keeper capture the lion.
All ends well when the loin is led off by the keeper, Mitchell gets a ride on Daddy's shoulders and the whole family head off for an ice cream.