In the books, he serves as the overarching antagonist of The Philosopher's Stone, The Chamber of Secrets, The Goblet of Fire, and The Order of the Phoenix the unseen overarching antagonist of both The Prisoner of Azkaban and The Half-Blood Prince, the main antagonist of The Deathly Hallows and the posthumous overarching antagonist of The Cursed Child. In The Philosopher's Stone, he was portrayed by Richard Bremmer in the flashback scene, but voiced by Ian Hart (who also played Professor Quirrell in the same film, Frankin Hall in Marvel's Agents of S.H.I.E.L.D., and Ryan McGregor in the BBC adaptation of Noughts & Crosses). In the films, he was portrayed in his main form by Ralph Fiennes (as an adult, who also portrayed Amon Goeth in Schindler's List, Rameses in The Prince of Egypt, Victor Quartermaine in Wallace and Gromit: The Curse of The Were-Rabbit, Raiden the Moon King in Kubo and the Two Strings, Heathcliff in Wuthering Heights, Barry in Dolittle, Francis Dolarhyde in Red Dragon, Dennis 'Spider' Cleg in Spider, and Hades in Clash of the Titans) in remaining five films Christian Coulson (16-year-old) in Chamber of Secrets and both Hero Fiennes-Tiffin (11-year-old) and Frank Dillane (15-year-old) in Half-Blood Prince.

Consequently, Voldemort became the most powerful and feared Dark Wizard of all time - surpassing fellow dark wizard Gellert Grindelwald in the process - as well as the founder and supreme leader of the Death Eaters. Initially, Riddle's goals were only to fulfill his role as Slytherin's heir as the years went on, however, he had expanded his ambitions into taking over the entire wizard world and shape it under his and Slytherin's supremacist views and ruling eternally. He is the heir of Salazar Slytherin who was destined to open the Chamber of Secrets and purge Hogwarts from all Muggle-born students. He is the archenemy of the franchise's titular protagonist Harry Potter, as well as the murderer of his parents James and Lilly Potter respectively. Tom Marvolo Riddle (DecemMay 2, 1998), better known as Lord Voldemort, is the main antagonist of the Harry Potter book and film franchise.

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