Spy

The Spy, originating from an indeterminate region of France, is a fan of sharp suits and even sharper knives as and relies on stealth and trickery to aid his team.

Using a unique array of cloaking watches, he can render himself invisible or can even fake his own death, leaving unaware opponents off-guard. His Disguise Kit lets him take on the form of any class on either team, allowing him to blend in while behind enemy lines before stabbing his unsuspecting "teammates" in the back. In fact, a swift backstab with any of the Spy's knives will kill any foe in a single hit - provided they aren't under the effects of any type of invulnerability or damage reduction.

In addition to being able to assassinate key enemies quickly and efficiently, the Spy has advantages over the Engineer. Using his Sapper, he can disable the Engineer's buildings by slowly draining their health until they are destroyed unless removed by an Engineer or a friendly Pyro wielding the Homewrecker or Maul. He can also make use of enemy Teleporters to surprise his foes.

Three other common Spy targets are the Heavy, Medic and Sniper. While the Heavy is the slowest class to begin with, he is even slower when he has one of his Miniguns revved up. This slower moving speed, along with the distraction of combat, makes for an easy opportunity for a backstab. Medics must focus on their healing target, which also leaves them vulnerable to backstabs. Snipers are obvious Spy targets due to their slower movement speed and lack of nearby awareness when scoped in with their Sniper Rifles. Snipers can use the Razorback to defend themselves from a single backstab, which also stuns the offending Spy.

Whereas most players can only see the names and health of their teammates, the Spy can observe the names and health of the enemy team as well, allowing him to relay useful intelligence. Only the Medic carrying the Solemn Vow shares this ability.

Description
He is a puzzle, wrapped in an enigma, shrouded in riddles, lovingly sprinkled with intrigue, express mailed to Mystery, Alaska, and LOOK OUT BEHIND YOU! but it is too late. You're dead. For he is the Spy - globetrotting rogue, lady killer (metaphorically) and mankiller (for real).