Kraid

Kraid is a gigantic monster who dwells in Kraid. He has three eyes and shoots large spear-like objects from his mouth. Kraid appeared in Metroid One, Super Metroid, Metroid Prime, and Metroid: Zero Mission as a boss. He also appeared in Super Smash Bros. Melee as a non-player character who tilted the stage Brinstar Depths with his claws. To defeat Kraid, Samus must shoot missiles into his mouth. After taking enough damage, Kraid will usually collapse into the ground flashing red. It is also worth noting Kraid's whole body is never seen, whether it is his legs, his tail, or his back.