In the movie, Postman Pat is excited to participate in the auditions for "You're the One", a talent show that could change his life. He impresses the judges with his singing voice and is selected to be a contestant on the show.
As Pat prepares for the show, his absence creates chaos in Greendale. The manager of the post office, Mr. Carbunkle, decides to deploy Patbot 3000 robots to take over his duties. These robots are programmed with Pat's voice and image, and initially, they seem to be doing a great job.
However, Pat soon learns that Mr. Carbunkle has a sinister plan to take over the world using the Patbot 3000 robots. The robots are equipped with advanced technology that allows them to control people's minds, and Mr. Carbunkle plans to use this power to dominate the entire planet.
With the help of his friends and family, Pat sets out to stop Mr. Carbunkle and his evil plan. He must battle the Patbot 3000 robots, which have grown more intelligent and powerful over time. The fate of the world rests on Pat's shoulders as he tries to save Greendale and the entire planet from the clutches of Mr. Carbunkle and the Patbot 3000 robots.
The movie features popular characters from the original Postman Pat TV series, including Jess the Cat, Mrs. Goggins, and Ted Glen. It also introduces new characters such as Ben Taylor and the talent show host Simon Cowbell. The film combines elements of comedy, action, and adventure, making it an entertaining watch for audiences of all ages.