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King Ka-thunk is a boss that appears in Super Mario 3D World as the boss of World 5-Castle: King Ka-thunk's Castle. He is a small, blue metal square with red feet and detached red hands. He also has a spike on the front and his back is pink and fleshy with a bandage on it. King Ka-thunk floats in the middle of a large K-thunk.
He serves as the boss of World 5. His main attack moving around the Ka-thunk before finally stopping in one of the corners. After this, the ground that King Ka-thunk will fall on glows red. King Ka-thunk moves faster and more erratically after every hit.
To damage King Ka-thunk, the player has to jump on his backside while he is face down. After each hit, parts of the arena will fall off. Once three hits are landed, King Ka-thunk is defeated, and the Warp Box to the Goal Pole is revealed.
King Ka-thunk later reappears as one of the bosses in World Flower-12: Boss Blitz.