Daniel Gregg is a fictional character from the TV series "The Ghost and Mrs. Muir." He is portrayed as the ghost of a sea captain who haunts a charming seaside cottage. Daniel is known for his witty personality and often provides guidance to the show's main character, Mrs. Muir, a widow who moves into the cottage. Throughout the series, Daniel's character adds a mix of humor and romance, as he develops a unique bond with Mrs. Muir. Their interactions explore themes of love, loss, and the supernatural, making Daniel an essential part of the show's charm and appeal.