Agahnim is the dark wizard in The Legend of Zelda: A Link to the Past on Super Nintendo. He was pretty cool.
After trying to capture Zelda and other maidens he faces Link in a showdown.
Even when you win, he sends you to the Dark World. That’s a terrible reward for victory.
You face him again in another awesome battle near the end of the game.
He’s defeated and you get to fight Ganon right afterwards.