Can the baby Bigfoot, Snowball, be reunited with his family? At the Secret Animal Society Sanctuary, hidden away in a remote corner of the country, Christmas is approaching. There's lots to organise with the winter weather drawing in, and all the endangered and rare animals to care for. Even fire-breathing dragons need food and shelter! When twins Eddie and Izzie and their family are awakened by two yetis just before the schools break up for Xmas, they realise through sign language that a baby Bigfoot has gone missing. It is starting to snow again - finding a baby animal with white fur is going to be difficult. Eddie, Izzie and their little brother Toby all have to get to school for the end of term costume party so reluctantly they head out and the search continues without them. At school, Toby discovers one of the children crying outside wearing a snowman costume. When the little boy doesn't talk Toby names him Snowball and tries to look after him. It's not long before the teacher realises what's happening and that it's not a child in costume after all! Snowball is taken to the zoo and it's up to Izzie and Eddie, with the help of Beth from the sanctuary, to sort out some quick costume changes and a rescue plan involving a sleigh powered by Cornflake the dragon. . .