Question: Terry Pratchett's The Colour of Magic two-part television adaptation starred an American actor best known for playing Mikey Walsh in what 1985 film?
Sentence (from "Terry Pratchett's Hogfather"): First aired in two 1.5-hour episodes on 17 and 18 December 2006 at 20:00 UTC, it was the first live-action film adaptation of a "Discworld" novel.
Relevant evidence: No