Plague

Magic Man is responsible for causing a series of plagues on Mars. Grob Gob Glob Grod banished Magic Man to the Land of Ooo for these crimes, and Glob considers him the most notorious feind in martian history for causing them. There are only 3 known plagues, and 2 of them are named. It is unknown how long any of these plagues lasted.

Plague of Shadows
The Plague of Shadows began when Magic Man brought every ones shadow to life. The shadows would attack everyone and ravage Mars.

Plague of the One-ness
The Plague of the One-ness occurred when Magic Man made every ones limbs grow together when they got together to sing their community song.

Hair plague
An unnamed hair plague was when Magic Man turned all the water on Mars into hair, and all the inhabitants grew so thirsty that they had no choice but to drink it. The hair made made every one go bald for an unexplained reason, and almost no one recovered from it.