One Tree House releases two more exciting new adventures in the new series about shapeshifting superheroes Pipi and Pou, written by award-winning Tim Tipene. Pipi and Pou are two cousins who transform into superheroes to solve a problem, under the watchful eye of their very wise Nana. Pipi shapeshifts into a Pouakai, a giant eagle, while Pou can become a Taniwha.