More information on z-hunt.com
Zombie Hunt is an Overwatch Workshop infection survival gamemode developed managed and updated by Blizzard user ZombieHunt#1601.
In Zombie Hunt, players play as suvivors who must do whatever they can to stay alive until the match time runs out. 20 seconds after match starts, random players will turn into alpha Reaper zombies whose only goal is to infect anyone and everyone they can lay their elbows on (with melee, obviously).
Defend yourself and your allies, run and hide to last as long as you can to try and win as a survivor; or if you're luckily infected, invite more to your family so everybody wins!