Mummipokey

Mummipokey is a boss character in the game New Super Mario Bros. for the DS. He is a mummy Pokey that will appear in the last level of world 2, and will shoot spikes at you, or just try to ram into you. To kill it, you'll have to either jump on it's head, or shoot fire balls at it. If you kill it while your Mini Mario, then you will be able to access world 4.