Question: Who is the actor who plays lord voldemort?

Disambiguated questions and answers:
context: 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).
question: Who is the actor who plays lord voldemort as flashback in Harry Potter and the Philosopher's Stone?
short_answers: Richard Bremmer
wikipage: Lord Voldemort

context: 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).
question: Who is the actor who plays lord voldemort as voice and likeness in Harry Potter and the Philosopher's Stone?
short_answers: Ian Davies

Ian Hart
wikipage: Lord Voldemort

context: 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).
question: Who is the actor who plays lord voldemort as teenager in Harry Potter and the Chamber of Secrets?
short_answers: Christian Peter Coulson

Christian Coulson
wikipage: Lord Voldemort

context: No context provided
question: Who is the actor who plays lord voldemort as adult in Harry Potter film series 4-8?
short_answers: Ralph Nathaniel Twisleton-Wykeham-Fiennes

Ralph Fiennes

context: Fiennes's nephew, Hero Fiennes-Tiffin, portrayed Tom Riddle as a child in "Harry Potter and the Half-Blood Prince". By the time filming arrived Christian Coulson was 29, and not considered suitable to return as the adolescent Riddle. Thomas James Longley was originally scheduled to take over the role, but last minute renegotiations saw Frank Dillane cast instead.
question: Who is the actor who plays lord voldemort as child in Harry Potter and the Half-Blood Prince?
short_answers: Hero Beauregard Faulkner Fiennes Tiffin

Hero Fiennes-Tiffin
wikipage: Lord Voldemort

context: Fiennes's nephew, Hero Fiennes-Tiffin, portrayed Tom Riddle as a child in "Harry Potter and the Half-Blood Prince". By the time filming arrived Christian Coulson was 29, and not considered suitable to return as the adolescent Riddle. Thomas James Longley was originally scheduled to take over the role, but last minute renegotiations saw Frank Dillane cast instead.
question: Who is the actor who plays lord voldemort as teenager in Harry Potter & The Half-Blood Prince?
short_answers: Frank Stephenson Dillane

Frank Dillane
wikipage: Lord Voldemort

Long answers:
knowledge: content: Harry Potter and the Philosopher's Stone (released in the United States and India as Harry Potter and the Sorcerer's Stone) is a 2001 fantasy film directed by Chris Columbus and distributed by Warner Bros. Pictures, based on J. K. Rowling's 1997 novel of the same name. Produced by David Heyman and screenplay by Steve Kloves, it is the first instalment of the Harry Potter film series.
wikipage: Harry Potter and the Philosopher's Stone (film)

content: Quirrell removes his turban and reveals a weak Voldemort living on the back of his head.
wikipage: Harry Potter and the Philosopher's Stone (film) Plot

content: Harry Potter and the Chamber of Secrets is a 2002 fantasy film directed by Chris Columbus and distributed by Warner Bros. Pictures, based on J. K. Rowling's 1998 novel of the same name. Produced by David Heyman and written by Steve Kloves, it is the sequel to Harry Potter and the Philosopher's Stone (2001) and the second instalment in the Harry Potter film series.
wikipage: Harry Potter and the Chamber of Secrets (film)

content: In Harry Potter and the Goblet of Fire, Voldemort is initially only heard, possessing the scratchy, weak voice heard in the first film. By the film's climax, however, he appears in his physical form for the first time, played by Ralph Fiennes.
Fiennes reprised his role as Voldemort in Harry Potter and the Order of the Phoenix[40] and Harry Potter and the Deathly Hallows – Part 1 and Part 2.
wikipage: Lord Voldemort Portrayals within films
long_answer: In Harry Potter and the Philosopher's Stone, the first movie in the Harry Potter franchise, Lord Voldemort latches onto Professor Quirrell's back to regain his power. Ian Davies, better known as Ian Hart, voices and provides the facial source for the character in this film, while Richard Bremmer portrays his physical likeness. In Harry Potter and the Chamber of Secrets, the second movie in the Harry Potter franchise, Voldemort is portrayed as his teenage self, who is played by Christian Coulson. In the fourth through eighth Harry Potter films, the adult Voldemort character is played by Ralph Fiennes. Harry Potter and the Half-Blood Prince features Voldemort as a child and a teenager. The child is played by Hero Fiennes-Tiffin, Ralph Fiennes' nephew, while the teenager is played by Frank Dillane.