Alexander Henry Fenwick Armstrong (born 2 March 1970) is an English actor, comedian, radio personality, television presenter and singer. He is the host of the BBC One game show Pointless, as well as the morning show on Classic FM. He is one half of the comedy duo Armstrong and Miller. Armstrong's television credits include Armstrong and Miller, Beast, Life Begins, Hunderby and Danger Mouse. He is also known as the voice of Mr Smith, Sarah Jane Smith's alien (Xylok) supercomputer in The Sarah Jane Adventures and the series 4 finale of Doctor Who.