The boss of Space Case is the Space Alien Pirate King. He's also the one who stole the golden bananas at the beginning of the game. He is a pirate ape. In order to defeat him, you will have to avoid his hand when he swipes it across the ground and hit him in the butt. He may also jump and spawn purple spiked balls. When he lands, the platform will shake immensely and the spiked balls will roll around. He sometimes also roars. When he roars, it is a great opportunity to attack.