L'isola di Noè

The Animals stop listening to Noah and turn against him in the aftermath of the flood. Meanwhile, Diamantina's other residents, a race of prehistoric frogs, learn of the inhabitants of the floating Island, and seeing them as invaders, they prepare to fight back...

Wommie the Wombat is appointed as Diamantina's law enforcement, but he abuses his newly gained authority by arresting animals for the smallest of offences, such as Mammothsbody sucking his trunk and Carmen eating ants without a "licence". Meanwhile, Chang and Ursula find a strange man-made machine washed up on the beach, and upon discovering it has a camera and human voices coming out of it, Noah orders to have the machine destroyed, believing that it will lead humans to Diamantina.

Salomi senses that Diamantina will flood again, so Noah orders Sacha to spread the word of the next flood. Rocco and Gertie plan to build a rock wall in front of their cave's entrance to protect the animals from the flood, while Noah and Nab struggle to find enough lava stones to fuel the Fire-Bowl. When Noah finds out what Rocco is planning he sets out to stop the wall from being built and convince Rocco that the wall won't protect them.

An enormous iceberg floats by the coast of Diamantina. The animals who are more used to colder climates, such as Noah and the Problem Walrus, are delighted by the sudden cold snap the iceberg brings, but everyone else tries to escape the cold by sleeping in the Fire-Bowl chamber. Upon discovering that there is a deep crevice within the iceberg, Gorm and the frogs devise a plan to trap the animals inside, so when the iceberg leaves it will take them with it.

Earthquakes are becoming more frequent in Diamantina. Gertie realises that Diamantina is not a safe place to raise her unborn baby, so despite Noah's protests, the Animals prepare to leave Diamantina for good. Ursula is elected as a new captain.