Thriller

Thriller  a multiplayer medal in Halo: Reach awarded for infecting fifteen humans in a row as a Zombie without dying in the Infection game variant.

It is represented by a silver six-pointed star with a human skull on a purple background in the center.

Trivia

 * This medal can only be unlocked in a game with 16 players, with one as the zombie.
 * It has replaced the Mmmm Brains medal, as the hardest Infection medal.
 * This medal is a reference to Michael Jackson's song "Thriller".