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If there’s anything Gojira (Godzilla) has taught us, it’s that radiation beats protein when it comes to growing big and strong. It just so happens that Fallout is glowing with radiation. In all seriousness, that’s poor fitness advice, by the way — that’s not what happens in real-life irradiation if you’re curious. However, these fictional misconceptions and liberties with radiation have given rise to some of the biggest monsters in the Fallout mythos. Suffice it to say, the wasteland is home to some giants, like the following absolute units.
Frank Horrigan
12 feet tall
You can learn more about Frank Horrigan in this guide. But in summary, he’s a tall and strong Enclave soldier who turned into a Super Mutant and was further experimented on. On top of that, the Enclave also fused Frank into his own custom 12-foot Power Armor both as a means of life support and control.
The result is quite possibly the most fearsome fighter in the Fallout lore. Frank can punch Deathclaws to death with his paws, or fists (but that doesn’t rhyme). That’s why he’s the final boss in Fallout 2 and the only reason you’re allowed to defeat him is because you’re a Chosen One and the plot demands it eventually.
Legendary Deathclaw
12+ feet tall (estimated)
Most Deathclaws only grow up to 10 feet tall on average. But those who survive the wasteland long enough tend to grow bigger (or perhaps they survived longer than others because of their inherent size, correlation not causation, and whatnot). They go on to become Legendary Deathclaws, which are estimated to be around 25 percent bigger than the average Deathclaw.
They also have bigger horns and a sharper appearance compared to other Deathclaws. For a Deathclaw to become this big and seasoned, they’d have to fight countless other Deathclaws or perhaps survive even bigger monsters in the wasteland. And considering the big ol’ brutes are typically solitary and independent hunters, that’s quite impressive.
Ant Queen
As big as a school bus
Fallout is also home to some rather freaky insects and Fallout 3 apparently doubled down on this with the Marigold Ant Queen. Some careless scientists used the same FEV or Forced Evolution Virus (which created Super Mutants) on a colony of ants and thus, the Marigold Ant Queen was born.
She’s as big as a standard yellow school bus and her spawn is proportionally big as well — worker ants the size of human children. She’s so big, she had to use a train tunnel to build her nest but thankfully, she’s not really that strong compared to other bosses once you overcome your irrational fear of bugs.
Wendigo Colossus
14+ feet tall
Now this is a big monster you can’t overcome with sheer bravery. The Wendigo Colossus from Fallout 76 is the stuff of nightmares (even for Fallout standards) and it has an even more horrific origin story. The creature was once called Earle Williams, who, due to dire circumstances, developed a taste for cannibalism.
Coupled with radioactive mutations, Earle Williams eventually turned into the abomination he is, with some of the humans he butchered and consumed getting assimilated into an organic amalgam. It’s still not clear what kind of mutagen led to the creation of such a horror, but there’s typically one universal reaction upon seeing it: feed it with bullets instead of meat.
Mirelurk Queen
20 feet tall
Turn enough Mirelurks into crab rangoon and their queen mother will come out to avenge them. The Mirelurk Queen is surprisingly big, especially if you zoom out and realize just how monumental it is when it’s not in your face trying to clobber you flat. It’s actually even bigger than Deathclaws.
Still, due to its size and slowness, you can easily outrun it and funnel it into a tight spot where it can’t maneuver. Some variants, like the Nukalurk Queen, however, are less merciful and the fight takes place in a more open environment. The best way to kill them remains the Fatboy launcher while they’re still far away.
Super Mutant Behemoth
20+ feet tall
Some Super Mutants got a little too extreme with the FEV dosage that their growth limit was practically removed. The result is these hulking titans of the wasteland, using car doors as their bucklers and fire hydrants as clubs. The growth came with a downside, as they have lost their ability to speak and are just mere mindless giants — violent ones, albeit.
Some of them can grow up to 30 feet in height and consequently, they’re among the toughest enemies in most Fallout games. The biggest ones might even be able to survive a mini-nuke, depending on where you aim.
Scorchbeast Queen
30+ feel tall
It’s hard to measure something like the Scorchbeast Queen since it’s usually flying and isn’t upright. Still, there’s no doubt it’s bigger than even the oldest Super Mutant Behemoth. This fell beast from Fallout 76 is a mutated bat. She was mostly responsible for spreading the Scorch plague all over Appalachia.
The Scorchbeast Queen is an endgame boss from Fallout 76 and requires several endgame players (ideally in Power Armor) to defeat. Even a fully-armed combatant in Power Armor easily gets dwarfed by the Schorchbeast Queen’s immense size. Thus, the Scorchbeast Queen has reigned supreme as Appalachia’s apex predator for decades post-war.
Liberty Prime
40 feet tall
Given how all the monsters and giants here are man-made anyway, Liberty Prime technically fits the criteria. It’s artificial and it has a mind of its own. While it’s programmed to side with democracy, it’s easy to hack into Liberty Prime and sic him against any enemy, regardless of ideals. Liberty Prime first appeared in Fallout 3 as a sentient robot built for war.
Liberty Prime also isn’t just for show. It’s also currently the most powerful NPC in all the Fallout games, boasting a whopping five million HP. For reference, the Scorchbeast Queen only has around 32,000 HP. At 40 feet tall, Liberty Prime can easily manhandle Super Mutant Behemoths. It’s a good thing it’s typically on your side during its appearances, but maybe future Fallout games might reconsider that fragile allegiance.
The Master
One Whole Vault
It’s an odd unit of measurement, but hey, Fallout is set in the U.S. In any case, The Master, which is the final boss of the first Fallout game, is an amalgam of organic material and electronic equipment. A whole vault system has become his body, making his size and discernible form difficult to gauge. Once, he was named Richard Moreau, a pre-war survivor of Vault 8.
He has since become so inhuman, that members of his organization kept referring to him as the Dark God or the Holy Flame. The only semblance left of his original, organic form is his disembodied head mounted on a computer. The rest of his body parts stretched over electronics like drapes. Unlike other monsters here, he’s still quite civil, talkative, and capable of reason.
Harold
Indefinite size & still growing
What could be bigger than a whole Vault? Well, here’s Harold. He was supposedly once a ghoul-like mutant who underwent an FEV transformation and his relationship with a parasitic tree named Bob (also infested with the FEV) has drastically changed him. He has become one with the tree and you can even talk to him in that form in Fallout 3.
Since he’s also technically a tree, Harold’s growth is indefinite, from his roots to his canopy. In his latest appearance in Fallout 3, Harold was around 30 to 50 feet tall (minus the roots). Since 20 years have passed from Fallout 3 to the Fallout TV show (the latest in the timeline), Harold has likely grown even bigger as a stationary talking tree.
In his next appearance, Harold would likely be a small ecosystem by then.
