Dora and Boots are on Rainbow Rock to watch the Rainbows, there they came across a shy little Rainbow (Arco Iris) hiding behind a little waterfalls. The Sun now needs another rainbow fast, Dora and Boots helps Arco Iris overcome his shyness by encouraging him. Dora, Boots and Arco Iris sets off to help the Sun by going over the Troll Bridge, across Sneezing Snake Lake and to Rainy Mountain.