The pupils of St Bernadette's and the madcap Mr Poppy (MARC WOOTTON) are back! When their new teacher Mr Shepherd (MARTIN CLUNES) loses his memory as well as Archie the Donkey, it's up to them to save the day and reunite him with his fiancée Sophie (CATHERINE TATE) in New York. Prepare for a race against time, fantastic flashmobs and plenty of Christmas fun on their greatest adventure yet.