Hidden away at the edge of the world lies an enormous trove filled with glittering jewels and shimmering gold doubloons - a treasure so grand that when the light reflects off of it, it creates breathtaking rainbows that span the skies. This treasure is, in fact, the very genesis of every rainbow to grace the world. Notoriously intrepid ocean explorers Olly and Beth embark on a perilous journey to locate this fabled treasure. However, a swarm of nefarious individuals are also seeking the treasure; chief amongst them is the notorious Snarky Sharkskin and his slippery Seahorse Gang. The safety of the treasure is vital, for if it falls into the hands of the treacherous Sea Lion Pirates, the fate of the Earth's rainbows will forever be compromised. Olly and Beth have only one option if they hope to safeguard the rainbow. "Dive, Olly, dive!"