Undergrads (2001)

S4E25 The Shy Rainbow

Dora and Boots head to Rainbow Rock to enjoy the colorful rainbows, but they discover a shy little rainbow named Arco Iris hiding behind a tiny waterfall. The Sun urgently needs another rainbow, so Dora and Boots encourage Arco Iris to come out of his shell. Together, the three set off on a journey to help the Sun, crossing the Troll Bridge, making their way across Sneezing Snake Lake, and climbing all the way to Rainy Mountain.