Although only just over a year old, Labrador Charlie is already living on borrowed time. An aggressive cancerous tumour is eating away part of his front leg. His owners, Louise and Mick, turn to Noel for help. His unique solution is to remove the tumour and replace it with a custom made implant that exactly mirrors Charlie's diseased bone, making him truly bionic: part metal, part dog.And the survival of border collie cross Sasha is at stake as Noel sets about giving her a new bionic knee. Meanwhile, senior surgeon Michael Hamilton is challenged by his smallest patient to date, Zippy the chinchilla. Zippy has broken both of the tiny bones in his arm after falling from a shelf. Can Michael come up with an ingenious solution to secure them back together?