Kingfin

Kingfin is a boss in  Super Mario Galaxy. It is a giant skeletal shark, living in the Bonefin Galaxy. To defeat it, Mario must attack it with Koopa Shells.

Kingfin can summon robotic fish from the craters in the planet, that work the same way as Torpedo Teds, chasing Mario down from all directions. The more damage Kingfin takes, the more robotic fish it will summon to attack Mario. After being hit with 5 Shells, it will explode, earning Mario another Power Star.

Trivia

 * Kingfins's name is a pun on the word "kingpin," which means: "The most important person in an undertaking or organization".
 * In an issue of Nintendo Power, and in the Prima Game Guide book, he is mistakingly called "the Bonefin".
 * The theme music in the battle with Kingfin is the same with Bouldergeist.
 * Kingfin is perhaps related to the Fishbone, a water enemy in Super Mario World.