Under the leadership of Captain Barnacles Bear, closely flanked by Lieutenant Kwazii Cat and Medic Peso Penguin, the Octonauts are always ready to embark on an exciting new mission!

When a dangerous underwater volcano threatens to erupt, the Octonauts must evacuate all the sea creatures nearby. But there is one creature that won't budge - a slow-moving, gelatinous Blobfish. Can Captain Barnacles, Kwazii and Peso get the Blobfish to safety before the volcano blows its top? Octonauts, let's do this!