From the Super Mario Wiki
“Hey!! Wait a sec! What’s happened to me!? I’ve got a fork sticking out of me, but I’m no piece of meat! Who stuck this in me? I’ll get you!”
—Wario, Wario Land 4
Zombie Wario is one of Wario's transformations in Wario Land II, Wario Land 3 and Wario Land 4. This undead alter-ego is triggered by being touched by a Zombie (Wario Land II and Wario Land 3), touched by a Ghost (Wario Land II), spat at by a Skeleton Bird (Wario Land 4), or coming in to contact with Cractus's Drool (Wario Land 4). When a zombie, Wario is impervious to all enemy damage, can defeat almost all enemies on touch, and fall through thin floors, making it quite useful at times. Unfortunately, he moves at a very slow speed, can barely jump (in his first appearance in Wario Land II, he couldn't jump at all), and often his ability to fall through thin platforms is used to hinder him. To return to his normal form, Wario must walk into light or fall into a body of water. He also sometimes falls apart and then might come alive again.
Zombie Wario appears once in Super Mario-Kun. Wario transforms into Zombie Wario by Cractus's drool. Sunlight reverts him to normal.
- The artwork of Wario Land II shows Zombie Wario's skin still fresh, apparently; however, his in-game sprite shows him white as a sheet. In both the Game Boy Color re-release and Wario Land 3, Zombie Wario's in-game sprite instead shows his skin as a darker green, possibly because of decomposition.
- In Wario Land 4, although the artwork shows Zombie Wario's skin with a purple tone, the in-game sprites show his skin with a green tone.