When a travelling circus is cancelled at the last minute, the children in Mr Pringle's class decide that Greendale should put on its own show. There is great excitement as everyone gets involved - Ajay organises the big top, Mr Pringle agrees to be the ringmaster and Reverend Timms provides the music with his one-man-band. Postman Pat has a great idea of his own for a dazzling double-act...so roll up, roll up and let the Greendale Circus begin!