Julius Jr. is a funky monkey with a penchant for invention. Together with his best pals, Worry Bear, Sheree, Clancy and Ping, they build a playhouse out of a simple cardboard box. But when they walk inside, to their surprise and delight, they discover that ordinary objects magically come to life and amazing adventures are just a door away. Julius Jr. proves every day that the best inventions are the ones that help your friends.