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.

Kingfin appears to be a gigantic fish made completely of bones. It resembles a Fishbone and the bones are disappearing in parts of its body and it's teeth are extremely long.

Battle
When Mario goes into the waters of Kingfin's planet, it will appear with two robotic fish that track Mario down and take away one health. If Mario touches Kinfin, he will lose a health. The only way to defeat Kingfin is to grab one of the green or red shells on the floor of the planet and throw it at Kingfin. Once Kingfin is hit five times with shells, he will explode and release a 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 mistakenly called "the Bonefin". This is probably due to the fact that it's called "Bonefin Galaxy" as well.
 * The theme music in the battle with Kingfin is the same with Bouldergeist.
 * When Mario or Luigi close in on Kingfin, a Hip Hop background percussion beat starts.
 * Kingfin is perhaps related to the Fishbone, a water enemy in Super Mario World.
 * Although Kingfin looks like a skeletal shark, sharks don't have skeletons in the real world; they are cartilaginous.