Mask of the Beast

The Mask Of The Beast is the main antagonist of The Grim Adventures Of Billy & Mandy episode Sickly Sweet. It is a terrible curse object kept by the Grim Reaper.

History
The mask was made by a being called The Beast. Whoever puts it on must be nice, kind, friendly and happy. Or they will turn into a terrible, hideous, beast. Grim owns the mask and Billy decides to let Mandy wear it. Since Mandy is using her meanness, it made her become the beast even if she struggles to get the mask off her face.

Appearance
The wearer's appearance gains purple skin, a reptilian tail, donkey ears, buck teeth, horseshoes and fire breath.

Trivia

 * A parody of Majora from The Legend of Zelda.