When Queen Hippolyta sends her daughters, Wonder Woman and Nubia, to Atlantis to represent the Amazons, the Super Heroes team up with Mera to save the underwater kingdom from a dangerous foe! Young DC Super Hero fans ages 4 to 6 will enjoy this Step into Reading Step 2 leveled reader about teamwork starring Wonder Woman and Nubia, her Amazon sister. Step 2 Readers use basic vocabulary and short sentences to tell simple stories.