Gleeok (The Legend of Zelda)

Gleeok is known throughout the land of Hyrule as one of the toughest foes to defeat. This is a large dragon, and has anywhere from two to four heads. To defeat Gleeok, Link must destroy all of its heads. This is no mean feat; not only do fireballs come flying at Link from many directions, but whenever one of Gleeok's heads is severed, it will become prehensile and fly around, attacking him.

Gleeok was first introduced as three of the dungeon bosses in The Legend of Zelda. It was encountered first with two heads in Level 4, then with three in Level 6, and finally in Level 8 with four.