Gray Mann is the third lost son of Zepheniah Mann and Antagonist of TF2`s Mann vs. Machines Co-op Campaign. Put minor villian in The shadow boxers comic. The smallest of the Mann triplets, Gray was also the most intelligent of the three, and could speak perfectly after being born. Disgusted by this Zepheniah Mann was going to smother Gray, but before his father could smother him, Gray was abducted by a wild eagle and raised as one of its own. Years later, after being raised by his Eagle abductor and having killed and eaten her and her children, Gray Mann returned to civilization to build his corporate empire. A hundred years later, Gray assassinated his twin brothers Blutarch and Redmond Mann to take control of their respective companies. There is a company named Gray Gravel Co. which Gray Mann may or may not have a hand in.
Gray Mann is the man responsible for creating and sending robots to demolish Mann Co. facilities.
According to Zephaniah Mann, Gray Mann had also threatened to blackmail him for his cache of "miracle" gravel at some point.
Gray first mentioned in a birth certificate accessed via link hidden in a blood stain on the banner of the TF2 Offical Blog.
Additionally, an updated version of the last will of Zepheniah Mann was released shortly after the hidden link, revealing the secret piece of the will belongs to Gray Mann.
The smaller set of numbers along the bottom of the Barely-Melted Capacitor read 07180125. When split into four and translated into letters (A = 1, B = 2, etc), it reads "GRAY".
He murderd his brothers Blutarch and Redmond in the comic Blood Brothers.
In "The Shadow Boxers" comic released during the Smissmas 2012 update, it was revealed that Gray Mann owns Gray Gravel Co., a company for which a sign can be seen in the Gravel Pit map.