Harold is a rescue helicopter used for patrolling the line from up in the air in the Thomas & Friends television series. He first appeared in the story "Percy and Harold", where Percy raced him after being told 'railways were rather slow, and out of date". He was defeated and eventually earned Percy's trust. He now is a good friend of both Thomas and Percy. His only appearance in LEGO was his appearance in set 3300 Harold the Helicopter from the 2006 line. Since than he has not been seen and because of the cancellation of the line has now clarified that he will not be returning.