Sonic X - Season 1 Episode 22 Little Chao Lost

While exploring Tanaka's mountainous homeland, Cream and Cheese decide to take a swim. However Cheese is carelessly swept away down the river by a strong current, and the gang has to find him. When they reach the spot where they find Cheese, it's a beautiful, crisp lake inhabited by many chao that have been transported here as well. The gang begins to enjoy the company when unfortunately, Dr. Eggman is taking a hike too; and he plans to ruin the vacation!