This engaging series is sure to delight preschoolers with its colorful characters and crisp animation, which will help open kids' eyes to the world's diversity and perhaps pique their curiosity to learn more about the real-life versions of the characters. Kids will easily relate to the issues that Olly and his friends face in their relationships with each other and their underwater exploration, and they're well served by the strong positive messages about values like helpfulness, respect, cooperation, and honesty. --Common Sense Media