Reanimator

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The Medic brings some muscle to the merc side in the Robot War with some nifty new upgrades: He can now bring dead teammates back to life, put up an upgradable shield that repels projectiles while electrocuting robots, and shoot Mad Milk syringes. — Two Cities Update

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The "Reanimator" is a new item released within the Two Cities Update to be used on MvM maps. When a teammate dies, a revive-marker is placed above their death point. Once it is targeted with the Medi Gun, the player will be revived. There is no upgrade required to receive this item.