For those who dont know who the spy is?!

The spy is in the stealth category + has alot of close-combat weapon's his main weapon's are the disguise and the cloak which help's him get behind enemy line's and look like the enemy so he can walk up to them and BACKSTAB them, instantly killing them if used correctly. The spy is usually used to sap enemy engineer building the sapper slowly drain's the life out of it till it is destroyed helping the team get ahead.

good at: close-cambat
(The video below is not all game-play footage)