Task: Explanation
Input (English): David John Bradley (born 17 April 1942) is an English actor. He is best known for playing Argus Filch in the ""Harry Potter"" film series, Walder Frey in the HBO series "Game of Thrones" and Abraham Setrakian in "The Strain", although he is also an established stage actor with a career that includes a Laurence Olivier Award for his role in a production of "King Lear". Question: Which character does the star of Doctor Who: The First Doctor Adventures play in the Harry Potter series? Answer: Argus Filch
Output (English):  He is best known for playing Argus Filch in the Harry Potter film series, Walder Frey in the HBO series Game of Thrones and Abraham Setrakian in The Strain, although he is also an established stage actor with a career that includes a Laurence Olivier Award for his role in a production of King Lear.