THE LAST OF US’ Zombies Explained: Clickers, Bloaters, and More

HBO’s upcoming series The Last of Us looks like a pretty darn faithful adaptation of Naughty Dog’s groundbreaking 2013 action-adventure game. The game itself, though full of great set pieces and gameplay elements, was very much story-first, so adapting it to screen will not be that difficult. So if you haven’t played the game, you’ll be able to enjoy as it goes. But that also means you might just assume that The Last of Us‘ zombies are the typical undead shufflers. Not so! The once-human monsters of The Last of Us have a distinct progression and backstory that set them apart. Here’s everything you need to know!

An infected person attacks Ellie in a car in The Last of Us Part II.
Naughty Dog

The Last of Us Zombies Aren’t Zombies

I suppose, the first big thing about the zombies in The Last of Us is that they aren’t really zombies. At least, not zombies in the traditional, Romero-Kirkman way we think about them. The outbreak that causes the entire world to collapse in The Last of Us comes from a mutated strain of the Cordyceps fungus, and our non-zombie zombies come from this fungus and the infection it causes.

Cordyceps are parasitic fungi that usually attack insects, arthropods, or other fungi. Essentially, the Cordyceps fungus doesn’t tend to bug us too much in real life. However, in The Last of Us, a mutated version of the fungus enters human bodies via airborne spores and nestles itself in our brains.

In The Last of Us‘ universe, spores grow fungus in human brains until they eventually take over, creating a kind of zombie. The infection can also transmit via the saliva of those infected, so your typical bite. In this way, The Last of Us‘ zombies do offer us some traditional zombie aspects.

With that in mind, here are the stages of infection and consequent types of zombies at play in The Last of Us.

Stage One: Runners

Runners, infected people, attack Joel and Ellie in The Last of Us game.
Naughty Dog

The first stage of the Last of Us‘ zombie-creating infection is what survivors call “Runners.” These people will begin bleeding from their eyes, nose, and mouth, and run quite fast due to the fungus controlling their nervous systems. The base impulse of those at the Runners stage is to attack other people, often in hordes. While The Last of Us‘ Runners don’t possess any extra strength, their pain threshold is greater due, again, to fungus brain. (The answer to most questions of “Why can they do that?” is “Fungus Brain.”)

Stage Two: Stalkers

Concept art for The Last of Us game shows a stalker, an infected with distinctive fungal growths out of their head.
Naughty Dog

Stalkers are people who’ve been infected anywhere between two weeks and a year. The fungus, by this point, will have sprung out of their head and body parts, creating a barnacle look. The Last of Us‘ Stalkers, as their name suggests, don’t run toward their prey but will instead wait in dark corners and wait for unsuspecting people to walk by. Those at this stage of infection also may prop themselves up near a wall and allow the fungus to grow into it. They can then pop out of the fungus when someone traipses by.

When in the Stalkers stage, The Last of Us‘ zombies also tend to moan and cry in pain as the fungus takes over their muscles. So that’s a lot of fun.

Stage Three: Clickers

The colorful yet terrifying Clicker from the upcoming The Last of Us TV show bares its teeth and sports a coral-like head frill.

Probably the most distinctive type of infected in The Last of Us are the Clickers. These are people who’ve been infected for over a year. The fungus will have broken completely out of the top of their head, removing the victim’s eyes and replacing them with a sort of coral shape. The Last of Us‘ Clickers shamble around, emitting distinctive clicks which bounce off of walls and objects, allowing these infected zombie creatures to echolocate prey. The fungus will also have reinforced their muscles and calcified their skin, making the much stronger and more durable than in the earlier stages.

A consequence of the Clickers’ method of hunting is sound warfare, creating a terrifying portent of doom for people who walk into their general vicinity on The Last of Us.

Stage Four-One: Bloaters

The enormous, pustule-covered Bloater infected is a formidable boss in The Last of Us.
Naughty Dog

Yeah, it just keeps getting grosser, folks. After a person has been infected for many years, their bodies bloat and become entirely overrun with fungus. In this stage, The Last of Us‘ zombies are slow and can’t see, but the fungus has reinforced their bodies to the point that they’re basically tanks. Taller, wider, sturdier. Even shotgun blasts to the head won’t stop Bloaters. Only fire can topple these guys. They can also break off pieces of fungus from their epidermis and throw them as projectiles. Seriously, just disgusting.

Stage Four-Two: Shamblers

A giant, disgusting Shambler in The Last of Us Part II.
Naughty Dog

In areas of heavy water, like swamps and reservoirs, rather than turn into Bloaters, people infected for over a year will continue to shamble around relatively lithe. With the excess of moisture, the infected bodies of these infected zombies don’t calcify or grow in The Last of Us, but will instead emit and expel spores into the air. They also remain much quicker than those who are in either the Clickers or Bloaters stage.

Rare Stage: The Last of Us‘ Zombies Form the Rat King

A truly grotesque site, a mass of bodies and fungus, is the Rat King infected in The Last of Us Part II
Naughty Dog

If you’ve heard of the horrifying natural phenomenon of a rat king, you might have an inkling of what this would mean in the context of The Last of Us‘ Cordyceps zombies. Rat kings are when several rats in a confined space will get their tails inexorably entwined and move together as one to survive. This The Last of Us phenomenon is pretty similar to a rat king infected except with zombies.

If enough Stalkers group together for a long enough time, their fungal growths will connect up. At that point, whichever member of the collective is the strongest will act as the ambulatory legs. In The Last of Us Part II, this only happens after 20 years of infection.

Final Stage: The Last of Us‘ Zombies Don’t End with Death

Even after an infected body dies, the fungus will continue to grow and spread spores out into the air. This is why survivors tend to wear gas masks when they enter abandoned buildings; it’s best to burn bodies of the infected, rather than let them rot.

So that’s fun, right? Lots to look forward to in The Last of Us series when it comes to zombies and fungus. We don’t see a ton of the infected in the trailers thus far, however, the most recent does seem to show a Bloater, so that’s some good nightmare fuel for you.

The Last of Us will premiere on HBO on January 15, 2023.

Kyle Anderson is the Senior Editor for Nerdist. You can find his film and TV reviews here. Follow him on Instagram and Letterboxd.

This post has affiliate links, which means we may earn advertising money if you buy something. This doesn’t cost you anything extra, we just have to give you the heads up for legal reasons. Click away!