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 "Sean Astin"): In television, he appeared as Lynn McGill in season five of "24" and voices Raphael in the 2012 Nickelodeon "Teenage Mutant Ninja Turtles" TV series, Oso in the Disney Junior show "Special Agent Oso", and Chester The Cat in "Bunnicula".
Relevant evidence: No