Mario morphed into a shark, so his ability is to chomp through enemies and swim super fast without losing air. Whenever being hit by a foe, or leaving the water, Shark Mario will turn back into normal Mario.
Shark Mario marks his debut in Super Mario Galaxy 2.5. The Shark Mushroom first appears first in Falling Falls Galaxy in the mission, Chomp Your Way to Victory. In the same galaxy, Shark Mario races Guppy to the goal underwater for the second Power Star and battles the gigantic whale, Moody Rick for the third.