Zero believes that he is a hero, but the counting numbers think he is worthless until they get into trouble with some Roman numerals, and only Zero can help.

Learn all about big leaders who love and protect the Earth in this engaging and inspiring board book perfect for environmentalists-in-training! Now even the youngest readers can learn all about important people who help protect and take care of our Earth! Highlighting ten memorable environmentalists who paved the way, parents and little ones alike will love this discovery primer full of fun, age-appropriate facts and bold illustrations.

"The Underworld usually isn't anyone's idea of a fun place--except for Hades. He loves the dark and even the stinky smell of sulfur! But there is one thing that Hades is not a fan of...dogs. And when Zeus and his fellow Olympians encounter Cerberus--a mean, snarling, three-headed dog--Hades must conquer his fears and tame the dog in order for everyone to continue on to the Underworld and drop off their Titan prisoner, Oceanus, back where he belongs!"--...

Ten-year-old Zeus is kidnapped by the terrible Titans, merciless giants who enjoy snacking on humans, and when in self-defense he pulls a magical thunderbolt from a stone he begins an adventure to rescue his fellow Olympians from the evil Cronus.