<P> In Harry Potter and the Philosopher 's Stone , Voldemort 's manifestation is as a face on the back of Quirrell 's head , an effect achieved by computer generated imagery . Ian Hart , the actor who played Quirrell in the same film , provided the voice and the facial source for this character . Voldemort also appears in a scene in the Forbidden Forest where he is seen drinking the blood of a unicorn . As Voldemort 's face was altered enough by CG work , and Hart 's voice was affected enough , there was no confusion by Hart 's playing of the two roles . In that film , he was also shown in a flashback sequence when he arrived at the home of James and Lily Potter to kill them . In this scene Voldemort is played by Richard Bremmer , though his face is never seen . His next appearance would be in Harry Potter and the Chamber of Secrets as the 16 - year - old Tom Marvolo Riddle ( portrayed by Christian Coulson ) . </P>
who plays voldemort in harry potter and the philosopher 's stone
Ian Hart Richard Bremmer