Kingfin's Fearsome Waters
From the Super Mario Wiki
The player starts on an empty Starshroom with a Launch Star above it, which will send Mario to Kingfin's Planet upon use. Immediately upon landing in the water, a cinematic showing Kingfin approaching will play.
In order to defeat Kingfin, the player has to launch Green and Red Shells at him. After hitting him once, Kingfin will call out two Fish Bones to assist him, and four more will appear after attacking Kingfin for the third time. The Fish Bones will continue to appear in their group number until Kingfin is defeated. Attacking Kingfin for the fifth time will shatter him, rewarding the player with the Power Star.
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