Was available as an add-on during the City of Gears Kickstarter campaign.
Includes its own rules, a unique gear, a special city tile and the juggernaut miniature! When choosing to play with the Juggernaut, you’ll always add this tile to the middle of the map. Activating this tile causes the juggernaut to lumber into a neighboring tile, destroying an opponent’s worker in the process.
More info BoardGameGeek