Deep inside the Palombian jungle lays Monte Urticando, and ancient, nigh inaccessible volcano where millennia old cactuses grow. Every 15 years they flower, and the pollen temporarily drives away most of the dangerous predators. For the Marsupilamis, though, it's also the signal for a strange and cruel tradition: it's time for the young Marsus to learn how to fend for themselves, away from the protection of their parents. Will they learn to work together to survive?