The Postman's Here! Harry and His Bucket Full of Dinosaurs : Season 1 Episode 46

When a letter addressed to a 'Mr. Snow' is delivered to Harry's house, Harry concludes that Mr. Snow must live in Dino-World so he sets off with the dinos to hand-deliver the letter to him. After a series of adventures, Harry finds Mr. Snow but learns that the letter is not for him, it is for Mr. Snow's twin who lives on Harry's street!