Adventures of Mark Twain - The Mysterious Stranger

The Adventures of Mark Twain, released in the UK as Comet Quest, is a 1985 American stop motion animated fantasy film directed by Will Vinton. It received a wider theatrical release, still limited to seven major cities, in May 1985. It was released on DVD in January 2006.
The film features a series of vignettes extracted from several of Mark Twain's works, built around a plot that features Twain's attempts to keep his "appointment" with Halley's Comet. Twain and three children, Tom Sawyer, Huck Finn, and Becky Thatcher, travel on an airship between various adventures.