Ghastly King is the true final boss of Donkey Kong Jungle Beat as well as the true main antagonist. He resembles Cactus King and the Ghastly King is fought the same way as Cactus King with the only difference being that the Ghastly King is much stronger and has a few new moves up his sleeve.
Before reaching him, you must go through a similar level, as you went through to fight Cactus King. However, this time, the level is much harder with much more obstacles and things to worry about. His attacks are similar to that of Cactus King's, but include several new ones. The new attacks include the ability to spit balls of energy out of his mouth at you, as well as being able to kick him in midair. However, the balls can be destroyed by using the Sound Wave Attack.
Like the other bosses, Ghastly King has 500 HP. He can be attacked by either encountering him face to face, or by throwing him into the walls, which momentarily knocks him out and allows the player to punch him. If you attack him face to face, Ghastly King attacks Donkey Kong with a backhand slap, throwing him into the wall. If Ghastly is attacked enough times, he flies into the wall and is momentarily knocked out.
When Ghastly King is defeated, Donkey Kong receives 800 Beats and all the kingdoms are saved and DK is applauded for his efforts.
- It's unknown whether of not Ghastly King and Cactus King are the same person or if they're just twins.