In most cases, boss battles are meant to be a test of the players’ skills and evaluate just how much they’ve learned from interacting with the digital world up until that point in the experience. In the case of horror games, this usually means learning to manage fear, resources, and amateur cartography. That’s why it makes sense that boss battles make up some of the scariest moments in Survival Horror history, as these chilling challenges often represent the very best of what the genre has to offer.

With Resident Evil Requiem finally hitting store shelves this week, what better way of celebrating 9 mainline entries (and dozens of spin-offs) than by looking back on six of the scariest boss battles in Resident Evil history! After all, there are plenty of memorable biohazards to choose from, though some of our picks might not be the monsters you’re expecting.

As usual, don’t forget to comment below with your own personal favorite boss monsters if you think we missed a particularly frightening one.

With that out of the way, onto the list!

6. Verdugo – Resident Evil 4

While the Verdugo (also known as the U-III in the remake) can be accurately described as an undead Xenomorph with insectoid qualities, it’s the overall direction behind this encounter that makes it such a frightening experience. Not only is the Verdugo itself nearly invulnerable, but the game forces you to navigate a claustrophobic sewer system as you attempt to deal with this man-made monstrosity.

In fact, this is such a terrifying fight that the game actually does you a solid and encourages you to run away from the boss entirely, as even the developers were aware that a near-perfect organism would likely be too much for most players to handle the first time around.

Of course, that only makes it that much more satisfying when you finally replay the game and bring a rocket launcher to this fateful encounter.

5. Marguerite Baker – Resident Evil 7

I’d argue that Resident Evil 7 is hands-down the scariest RE game ever made, so it’s hard to pin down a singular moment that really stands out above the rest. However, when it comes to boss fights, the blood-curdling battle against Marguerite (the Mold-infected Matriarch of the Baker family) is easily one of the freakiest entries on this list.

While her “human” appearance is unsettling enough due to the game’s grimy textures and Texas Chain Saw Massacre–inspired aesthetics, the boss battle has Marguerite elongating her limbs to inhuman proportions as she controls disgusting insects and hunts you down through a dilapidated Green House.

However, even after all that, this boss encounter still isn’t nearly as scary as constantly running across the seemingly catatonic Eveline as she stalks you throughout your playthrough.

4. HAOS – Resident Evil 6

I’m aware that Resident Evil 6 is something of a controversial topic amongst fans of the series, but I think even the game’s biggest detractors are aware that the title contains a handful of terrifying moments that are worth remembering despite being part of an overall messy experience. One such highlight is the climactic fight against HAOS at the end of Chris Redfield’s campaign.

Looking like a Kaiju-sized cross between a humanoid corpse and a translucent octopus, HAOS was Neo-Umbrella’s attempt at creating an ultimate bioweapon capable of spreading the C-virus infection across the entire planet. Of course, what really makes this malformed creature so scary is its uncanny design, with its recognizably humanoid features combined with its desperate movements and “unfinished” aesthetics, making this boss unpleasant to even look at.

3. Lisa Trevor – Resident Evil REmake

Unkillable bosses were already a familiar trope by the time Lisa Trevor was added to 2002’s Resident Evil remake, but there’s just something off about this lumbering patient zero that continues to haunt our nightmares over two decades later. Whether it’s the fact that she appears to be wearing a mask made out of human skin or her pained movements as her arms remain trapped inside of a medieval-looking torture device, Lisa Trevor feels like she was a part of Capcom’s iconic Survival Horror franchise from the very beginning.

Terrifying and tragic in equal measure, Lisa is certainly one of the most memorable monsters on this list, even if her design isn’t quite as extreme as some of the other horrors we’ve mentioned so far.

2. Donna Beneviento – Resident Evil: Village

Resident Evil: Village may have been developed as a more action-packed follow-up to the nightmarish thrills of its predecessor, but that doesn’t mean the game is completely devoid of memorable scares. In fact, I’d argue that the title actually boasts one of the most horrifying enemy encounters in the whole franchise, with the entire House Beneviento sequence serving as an extended boss battle where Ethan’s very mind is turned against him.

Combining effective genre tropes from doll-horror movies such as Annabelle and even boasting a freaky baby monster that would make Eraserhead blush, the Beneviento encounter is proof that Capcom remains fully capable of crafting innovative scares even after all these years.

1. Nemesis – Resident Evil 3

Also known as “The Pursuer”, Nemesis is probably the most obvious entry on this list, but can anyone really argue against the idea of a final boss that stalks and attacks you from the very beginning of the game?

Sure, the creature’s design and aggressive behavior are intimidating enough, but it’s the build-up to that final confrontation that earns him the number-one spot on this list. Repeatedly trying and failing to get this bio-engineered Terminator off your tail just to have him show up again is the reason why Nemesis will forever be remembered as one of the scariest bosses in all of gaming – not just the Resident Evil franchise.