|SPOILER WARNING: This article may contain major plot and/or ending details.|
Proceed at your own discretion.
There seems to be multiple sets of appendages. Definitely insectoid. Oh, it's stunning. When they powered up the reactor, it must have drawn them toward the surface to feed.
The Endoswarmers are not named onscreen; Keiko Randa refers to them as "some new form of MUTO" upon first seeing their eggs, while the closed captions on Apple TV+ simply refer to them as "insects." The Endoswarmer name was first reported by Entertainment Weekly. The collective name Endoswarm has also been offered by a USA TODAY article and by VFX supervisor Sean Konrad in an interview for Newsweek. Furthermore, in a scene breakdown for Rotten Tomatoes, director Matt Shakman referred to the Endoswarmers generically as "millipede creature" and "millipedes."
Endoswarmers resemble arthropods such as millipedes or centipedes, but with shorter, armored bodies, a single row of sharpened spikes on their backs, and longer legs. They are dark gray in color, with orange highlights. The Endoswarmers also appear to lack any visible eyes and possess long antennae on their head.
The Endoswarmers in Kazakhstan pursued Dr. Keiko Randa and Lee Shaw from the moment they were born. Catching Keiko required them to pile on top of each other; as Monarch: Legacy of Monsters co-creator Chris Black describes, the creatures "work together to create something bigger and more terrifying."
- Monarch: Legacy of Monsters (TV 2023-2024) [episode 1]
In 1959, Monarch agents Bill Randa, his wife and fellow doctor Keiko, and Lee Shaw followed Geiger counter readings in Kazakhstan to a deserted nuclear power plant. To their shock, they found that the Geiger counter stopped detecting radiation once the power plant was in sight. As they walked through the ruins, Keiko observed that every spike in radiation she detected soon faded, as though something was absorbing it. Shaw instead suggested that something was eating it, like the monsters they had encountered before. They set off a series of charges around the plant, and were delighted to find chambers in the bedrock beneath them, which supported the Randas' controversial theory—until a minor earthquake hit the area.
Keiko, Bill, and Lee ventured inside one of the buildings and found a pit with dozens of Endoswarmer eggs at the bottom. They prepared to descend to take genetic samples of this new species despite Lee's reservations, although he limits them to five minutes. The earth split again after Keiko and Lee reached the bottom of the pit. Keiko observed that the unhatched monsters were insect-like, and theorized that they were drawn up from underground by the nuclear reactor. Tremors continued to rock the building as the eggs hatched and the newborn creatures rushed towards them. Bill started to pull up Keiko, with Lee climbing his own rope. One of the Endoswarmers grabbed onto Keiko's leg, with countless more following as they piled onto each other. Lee emptied his pistol into them, then tried to pull Keiko to safety, but Bill's grip slipped on the rope and the monsters dragged her back into the pit.
The Endoswarmers passively fed on radiation from inside their eggs, with Keiko noting that any readings of radiation from inside the nuclear power plant quickly disappeared.
Lee Shaw was able to kill several Endoswarmers with his pistol.
- Though referred to as Titans by Monarch: Legacy of Monsters co-creator Matt Fraction, the Endoswarmers' classification by Monarch has yet to be revealed.
This is a list of references for Endoswarmer. These citations are used to identify the reliable sources on which this article is based. These references appear inside articles in the form of superscript numbers, which look like this: 
Showing 14 comments. When commenting, please remain respectful of other users, stay on topic, and avoid role-playing and excessive punctuation. Comments which violate these guidelines may be removed by administrators.