Poison Mario is one of Mario's Power-Ups that debuts in Ultra Mario World. Mario can become Poison Mario by grabbing the Poison Flower or in Super Mario Universe: The Darkness Adventure, its the Poison Mushroom.
Poison Mario can walk on Poisoned Water for a long period of time and also can spit out poisoned balls and poisoned bubbles to kill enemies. Electrical enemies can't be defeated by the power-up.
- Mario can only transform into Poison Mario with the Poison Flower, not with the Poison Mushroom. The Mushroom is a kind of "evil mushroom" that is really poisonous and will make Mario small or die.