Kingfin

Kingfin is a boss in  Super Mario Galaxy. It is a giant skeletal shark, living in the Bonefin Galaxy.

Kingfin can summon robotic fishes 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 fishes it will summon to attack Mario.

Kingfin appears to be a gigantic fish made completely of bones. It also bears a resemblance to a Fishbone.

Battle
This battle practices using shells. When Mario goes into the waters of Kingfin's planet, it will appear with two robotic fishes that track Mario down and take away one health. Mario and Luigi cannot defeat these robotic fishes; they must simply avoid them. If Mario touches Kingfin, 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". However, he doesn't appear to lead anything.
 * 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. However, when Mario or Luigi come closer to Kingfin, a Hip-Hop background percussion beat starts. Music speeds up once Kingfin takes damage three times.
 * Although Kingfin looks like a skeletal shark, sharks don't have skeletons in the real world; they are cartilaginous. Therefore, Kingfin may possibly be another species of fish.
 * Kingfin is the only boss in Super Mario Galaxy that appears in a bonus galaxy.
 * Kingfin is the boss with the second largest amount of hit points in Super Mario Galaxy, with a total of five. Bowser from Bowser's Galaxy Reactor has six.