The Adventures of Mark Twain, released in the UK as Comet Quest, is a 1986 American stop-motion animation film directed by Will Vinton (best known for "The California Raisins" animation). It received a wider theatrical release, still limited to seven major cities, in January 1986. 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. The concept was inspired by a famous quote by the author:

"I came in with Halley's Comet in 1835. It is coming again next year (1910), and I expect to go out with it. It will be the greatest disappointment of my life if I don't go out with Halley's Comet. The Almighty has said, no doubt: 'Now here are these two unaccountable freaks; they came in together, they must go out together.'" (Twain died one day after Halley's Comet reached perihelion in 1910.)

Included are sketches taken from The Adventures of Tom Sawyer, The Mysterious Stranger, "The Diaries of Adam and Eve (Letters from the Earth)", "Captain Stormfield's Visit to Heaven" and a rendering of Twain's first story, "The Celebrated Jumping Frog of Calaveras County". References are made to his other works, including "The Damned Human Race".

The sequence based on The Mysterious Stranger received over ten million views upon being posted on YouTube. The title of the video claimed it was "banned from TV" and makes no direct reference to the film.