The Master Mind is a community-created cosmetic item for the Engineer. It is the Engineer's scalp with its skin ripped off and skull removed exposing his brain, which has a mechanical apparatus attached to it.
This item can only be worn around Halloween or during a Full Moon; at other times of the year, it does not appear in gameplay, unless the server has Halloween mode enabled. However, it can be equipped at any time and can still be viewed on the loadout screen even when it is not visible during games.
The Master Mind was contributed to the Steam Workshop.
- [Undocumented] The Master Mind was added to the game.
- [Undocumented] Updated VMTs of the Master Mind.