Stake out the Bay Family's lush territory, where matriarch Anna offers lavish feasts but faces internal dissent. Size up her rival Mia, the streetwise Townies leader who's eyeing a lifestyle upgrade, and check in with the isolated Mangrove Family.

Anna, the Bay family matriarch, helps raise the newest members of the community. Elsewhere, a flood in the mangroves nearly sweeps away a baby, and the Townies eat through their resources.

Trouble brews in Marina Bay when the Nomads and Townies squat on Bay family territory whilst the family is away upriver. When the Bay family makes a surprise early return, conflict looms.

Anna's clan is back to Marina Bay, where two otter families have been trespassing; Mia catches Anna's scent and hustles the Townies out of reach; the Nomads remain blissfully unaware of the coming conflict.

The Bay family's matriarch chases the Nomads out of her territory for good; examining the surprising birthing den where the Townies' leader, Mia, settles in; the Mangrove Family pal around with stray dogs.

Seeing the babies' first swimming lessons before the clan moves to new digs, and welcome an era of otter peace as the Mangrove Family becomes a park's main attraction.