Hordes of the living dead will stagger across the city during two nights of terror - and people of all ages are desperate to take on the monsters in an adrenaline filled game.
Almost 2000 people will take part in the game in Glasgow, which was the setting for an undead army when Brad Pitt film World War Z was filmed in George Square.
A number of roads in Scotland Street industrial estate will close between 6pm and midnight tonight, Friday and Saturday, to allow the action to take place.
The cult street game 2.8 Hours Later, which also took place over two nights earlier this month, involves participants trying to escape the zombies who are out to get them.
Decisions are made by players along the way which have repercussions on the route they take, the characters they meet and their chances of success.
Roads, including Watt Street, Vermont Street, Stanley Street, Scotland Street West, Portman Street, and Admiral Street, will be affected by closures.
Co-founder Simon Evans said: "We are delighted to be returning to Glasgow for a third year.
"The game has always been received with enthusiasm, and the city has one of our strongest fan groups and loyal zombies.
"It is a totally unique activity and a great way to have fun with your friends as you basically become a character in your own horror film or video game."