A routine health check takes a frightening turn for lion brothers Lwazi and Ato. Keepers anxiously await to see if otter couple Odie and Paula are expecting, and a gorilla called Kanzi must prove she can receive vital medical care.

A team races to save a wombat named Daisy suffering from mysterious health issues before it's too late. Keepers Georgie and Luke venture on a challenging road trip to transport a giraffe calf, and a secret hidden underneath the Melbourne Zoo is revealed.

Keepers become concerned when the big move for lion brothers Lwazi and Ato is delayed. Young rhino Kifaru is challenged during a mating ritual, and a brilliant plan saves the endangered mountain pygmy possums.