But there was also another wizard.
A really evil wizard.
He was so evil that nobody even said his name.
Everybody just called him You-Know-Who.
You-Know-Who had red eyes and a nose like a snake.
We won't even show you a picture of You-Know-Who,
because it would be too scary.
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You-Know-who wasn't happy.
He was angry because he wanted to be the greatest wizard in the world instead of Professor Dumbledore.
And so You-Know-Who started trying to take over the world.