Baby River Dolphin got stuck in a puddle after a rainstorm! But he must get back home because today is the day he'll turn pink like a BIG River Dolphin! Diego, Blue, Sprinkles and Baby River Dolphin follow the rainbow home. Together they make 'beaks' to remove all of the muddy leaves from their way, they swim backwards to get away from the waterfall, and twist between the fallen tree branches to get home. They make it just in time for Mami River Dolphin & Sibling River Dolphins to see their little river dolphin turn pink, like a Big River Dolphin!
- It is shown that Diego is very ticklish.