Sumatran tiger cubs Spot and Stripe are now outgrowing keeper Giles Clark's home and developing adult tiger behaviours. The time comes for them to leave the family home and reintegrate with the rest of the tigers at Australia Zoo. These tiger cubs offer real hope to the plight of wild Sumatran tigers, and Giles believes their unique experience in his family home will make them even more suitable for a life in captivity.

As they move back to the zoo, Spot and Stripe's development is far from over. Giles gives the cubs their first swimming lesson, and they meet the adult tigers they are going to share their lives with. But all is not well with Spot, who is rapidly developing an eye condition that leaves him fighting for his life.