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'''Lord Voldemort''' (born ''Tom Marvolo Riddle'' and also known as "You know who" or "He Who Must Not Be Named" or "The Dark Lord") is the evil wizard and principle antagonist in the series. Like Harry, he went to [[Hogwarts]]; unlike Harry, he was in the Hose of Slytherin. Prior to and just after Harry's birth, Voldemort and his followers, known as "Death Eaters", attempted to take over the wizarding world. During the attack on the Potters' home, the killing curse rebounded on Voldemort, and he became disembodied, but didn't die thanks to his horcruxes. In the first books of the series, he schemes to be resurrected and regain his former power, something which is achieved in the fourth book. He begins to rebuild his empire and continues his attacks on Harry in the final three books; however, at the height of his new power he is slain by Harry during an epic battle at Hogwarts.

'''Lord Voldemort''' (born ''Tom Marvolo Riddle'' and also known as "You know who" or "He Who Must Not Be Named" or "The Dark Lord") is the evil wizard and principle antagonist in the series. Like Harry, he went to [[Hogwarts]]; unlike Harry, he was in the Hose of Slytherin. Prior to and just after Harry's birth, Voldemort and his followers, known as "Death Eaters", attempted to take over the wizarding world. During the attack on the Potters' home, the killing curse rebounded on Voldemort, and he became disembodied, but didn't die thanks to his horcruxes. In the first books of the series, he schemes to be resurrected and regain his former power, something which is achieved in the fourth book. He begins to rebuild his empire and continues his attacks on Harry in the final three books; however, at the height of his new power he is slain by Harry during an epic battle at Hogwarts.

Five different actors have played Voldemort at different stages of his life and/or forms.

Ralph Fiennes plays Voldemort starting in ''Harry Potter and the Goblet of Fire,'' although other actors have played Voldemort at different stages of his life and/or forms.

===Albus Dumbledore===

===Albus Dumbledore===