Albus Dumbledore Explains Tom Riddle's Transformation into Lord Voldemort

Albus Dumbledore reveals that Tom Riddle, the boy who manipulated Ginny through the diary, grew up to become Lord Voldemort. He explains how Riddle transformed himself through Dark Magic, becoming almost unrecognizable. Arthur Weasley scolds Ginny for not recognizing the danger of the diary, but Albus Dumbledore reassures them that many wizards have been deceived by Lord Voldemort.