oriented, so actor  Andy Serkis (qv), the voice of Gollum, played the character in a  motion capture suit. Serkis also played scenes with  Elijah Wood (qv) (Frodo) and Sean Astin (qv) (Sam) on set to  give the actors a focal point. On those occasions when Serkis was  actually in shot Gollum was composited over him in post production.