The Last of Us has finally brought one of the most memorable elements of the game to its live-action show – spores. TLoU Season 2, Episode 5 is a massive shift in the web series, one that finally brings the show more in alignment with the core mechanics and tone of the game. So what are spores and how do they infect those nearby?

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The Missing Link Between Game and Show in TLoU Saga
Spores have been a frightening representation of the extent of the Cordyceps infection in the game. They float in the air, invisible to the human eye but equally lethal, forcing survivors to wear masks or die. In the HBO show, spores didn’t exist…until today.

For over a season, showrunners Craig Mazin and Neil Druckmann were arguing against having spores in the show. Why? For realism and emotional resonance. If all the main characters are wearing gas masks at all times, it would cover both their faces and expressions. It would be difficult to make the emotional stakes of each scene visible, reducing the impact of deeply moving scenes, like when Ellie loses Joel. But Episode 5 marks a turning point.
TLoU S2E5: Spores Introduction and Rat King’s Foreshadowing
Titled “Day Two,” this episode quietly raises tension. It starts with a shadowy meeting between Hanrahan and WLF leader Elise, who explains why the hospital basement was quarantined. Her son Leon discovered floating spores and, knowing it was dangerous, had the area sealed off even though he was trapped there, along with others.

The line: “The whole floor was empty. Not even rats.” To game players, this is not just a dialogue, it’s foreshadowing. The basement is now empty, but it’s probably concealing something far worse than the dead. Something that those who have played the game can all too easily picture as the Rat King.
The Rat King is quite possibly the most frightening enemy in The Last of Us Part world. The showrunners putting in the “not even rats” line wasn’t a coincidence.
Why Spores Are So Dangerous
But spores are not only a setup for future monsters, they are a tone shift. While Ellie pursues Nora to the lower floors of the hospital, we first become aware of airborne spores. Nora was coughing and struggling to catch her breath as she inhaled spores. It’s raw, it’s frightening, and it brings the actual horror of the infection back into the forefront once again.

For those unfamiliar with the games, spores are the final, lethal stage of infection. Once the host has died, the Cordyceps simply continues to grow and spews out spores into the air. Anyone who breathes them in is infected instantaneously. It’s an invisible, silent, stealthy, and omnipresent killer.
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- The Last of Us Season 2: Who Is the Seraphites (Scars) Leader? [Spoilers]
Throughout Season 1, the infection was spread primarily through bites and tendrils. But now that spores are added to the equation, the infected zones appear all the more horrifying. Spores are like fungal air that is thick and suffocating, with death lurking in every breath. It’s no longer even horror, it’s immersion.
This is also a demonstration of Ellie’s immunity. In the game, spores are a significant factor in how the world discovers she is immune, as she walks through a cloud of spores unharmed. The show did not do this the same way, but Season 2 finally gets it right on an emotional scale.
Ellie Becomes the Last Surviving Human in the Post-Apocalyptic World
In episode 5, we see Nora wheezing and coughing, while Ellie remains untouched. It’s executed so perfectly on camera, showcasing how unique Ellie is. Not only is she immune, she is the only human being who can survive in this world.
The spores are crafted perfectly in the series. The showrunners didn’t opt for flashy imagery or excessive visuals. They instead rendered the fungus as slow, silent, and sinister.
The introduction of the spores makes them a permanent part of The Last of Us world, and that opens up a whole new universe of horrible possibilities. It’s not so much a question of fleeing from the infected anymore, it’s a question of surviving the air you breathe. That also brings the cordyceps threat back into the picture.

Season 2 has been very much centered around human conflict so far. We saw an emotional Ellie hellbent on taking her revenge, and the never-ending conflict between WLF and Seraphites. However, the spores are here to remind us of the overarching plot of the show. Humanity is still fighting a war against an enemy fungus that keeps evolving and spreading to new areas.
The episode also hints that the spores won’t be restricted or confined to Seattle. Elise informs them that they are not there yet at the air vents, but spores do not recognize borders. For now, they are restricted to one basement, but they might spread anywhere. It will not be long before other parts of the city are in danger.
Future of Season 2 with Spores and Rat King
Season 2 will feature more survival horror with spores affecting the characters, killing many of them. The Rat King’s arrival and new infected areas. Fans of The Last of Us Part II are aware of what is going to happen in the next episodes. If the show continues on the same path, we’re in for some of the scariest and most unforgettable episodes yet.

The spores’ introduction not only satisfies long-time fans, but it benefits the show as well. It hints at the fear that Season 1 lacked and roots the series further in the original game material without sacrificing realism. The Last of Us finally feels deeply infected.