In Animal Ark, Mandy Hope and her friend James Hunter help helpless and injured animals throughout the series, and sometimes she helps perished animals on a "mission". Her parents, Adam and Emily Hope, are vets in Animal Ark (the veterinary practice that gives the series its name), which comes in handy in helping the animals she comes across. Mandy has three rabbits, Flopsy, Mopsy, and Cottontail. She is definite that she will become a vet and help sick animals in need. Other characters are Simon, a fellow nurse, and Jean Knox, the receptionist. There is also a black lab named "Blackie" that belongs to James who sometimes goes on the adventures. Mandy finds that many people are actually very fond of animals and have a heart of gold. When she isn't working with animals, she is helping her parents with their work.
So when Mandy meets stuck-up Susan Collins she quickly decides that the only good thing about her is her pony Prince! Then Mandy realises that Susan's determination to win at show-jumping threatens the life of the beautiful pony. Can she convince Susan before it's too late?