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The Ghastly King was the final boss of Donkey Kong Jungle Beat. He is a Cactus King-look a like in the game. Ghastly King is fought the same way as Cactus King, and looks exactly like him - he may even be him with another name.
Before reaching him, Donkey Kong must go through the same exact level he went through to fight Cactus King. However, this time it is much harder. Ghastly King was also harder, having a few more attacks.
It looks as if he put a spell on the Kong kings because after defeating him, Dread Kong, Ninja Kong, Karate Kong and Sumo Kong celebrate Ghastly King's defeat and don't attack Donkey Kong, instead, they cheer him.