Toopy is a funny, friendly, optimistic, impulsive mouse whose insatiable zest for life is matched only by his love for his best friend, Binoo. Binoo is a lovable cat who is logical, sensible, and thinks before he acts. Binoo is devoted to his best friend Toopy. The characters are charming and endearing. The kindness, respect, and gentle aspects of childhood friendship are emphasized as the friends explore and discover the world around them with their colorful adventures.