The Octonauts try to answer a weta's call for help, but they can't find the right one! Turns out there are many different species of weta in New Zealand, so they have to do some detective work to find their target.

When unseasonably warm temperatures wake a family of hibernating dormice, Paani, Tweak, and Shellington try to protect the sleepwalking mice from lurking predators.

Kwazii, Calico Jack, and Tracker find a nest floating in the water off the eroding coast of the Aleutian Islands. They set out to return the eggs to their mother, but a hungry raven has other plans.

A huge storm in Vietnam sends floodwaters into a nearby cave, trapping Ryla, Kwazii, Shellington… and a tiger. Thankfully, a cave-dwelling woodlouse helps them find their way out before the tiger catches up with them.

In the aftermath of a fire in the Everglades, Ranger Marsh calls on Dashi & Tweak to help him figure out who stole a Florida box turtle's egg.

Tweak, Paani and Dashi work with a team of fire ants to engineer an escape route when the Paraguay River floods the ants' home.