The Wonder Pets receive a call for rescue from an egg and travel to Yellowstone Park. There, they face obstacles such as a mischievous prairie dog and a gushing geyser. As they cope with the unique difficulties of trying to save an egg, they also wonder the whole time just what type of animal the egg contains. When a baby flamingo is trapped in a muddy pit, the Wonder Pets most fly into a colorig book to save him. This colorful world provides an exciting adventure for the Wonder Pets, who face the challenge of rescuing the flamingo without being trapped themselves.