Thriller medal

Thriller is a Halo: Reach medal that is awarded to players who have infected 15 humans without dying. It is represented by a skull in the middle of a Running Riot medal. It appears on the Reach Service Record.

Trivia
This medal can only be unlocked with 16 players, with one as the zombie.

It has replaced the Mmmm Brains medal, as the hardest.

This medal is a reference to Michael Jackson's song "Thriller".