Arcadia Oaks-pedia
Arcadia Oaks-pedia

Sergeant Costas is a recurring character of 3Below and a cameo character of Trollhunters: Rise of the Titans.

He was Colonel Kubritz's comrade, until he defected from his superior after she falls into a state of insanity and later becomes an ally to House Tarron.


3Below (Part One)[]

3Below (Part Two)[]

Rise of the Titans[]

Sergeant Costas makes a brief cameo in Rise of the Titans, where he is seen evacuating the citizens of Arcadia-Oaks.

Physical Description[]

Sergeant Costas is a European man with a broad face and a slightly bulbous nose. He wears a brown military regulation uniform and a brown soldier's cap. He also wears black trousers.


Unlike Kubritz, Costas is more well-meaning, supportive, and deeply cares for the lives and safety of his soldiers at Area 49-B, as well as protecting Earth. As a close acquaintance, he was deeply concerned about Kubritz's sanity, as well as her intentions and alliances with some of the worst aliens in the galaxy (Morando being the prime example).

He also has far more moral decency than his superior. In "Asteroid Rage", he was genuinely surprised and shocked that Kubritz went back on the promise she made to Aja, Krel, and their allies earlier. He also tries to express his doubts to his commanding officer that her alliance with Morando was more like a "deal with the devil", which she ignores. He is deeply reluctant to follow Kubritz’s wrong ideas and he even displays some ounce of empathy for Tronos Madu when his superior tortures him for just being an alien and "going back on his word" (even though Kubritz attacked him first). He is also deeply shocked when Morando kills Tronos, even more so than Kubritz.

Not wanting to take anymore of Kubritz's insanity and hypocrisy, Costas switches sides and aids the Akiridions and the people of Arcadia in their struggle against the god-induced Morando and a power-hungry Kubritz. He also tries to help the people of Arcadia to the best of his aid, being a hard-working person.

Powers & Abilities[]


  • Combatant: As a sergeant of Area 49-B, Costas is fairly knowledgable with hand-to-hand combat, although not as great as Kubritz.
  • Marksman: Costas can fire his neurometer blaster with great aim.
  • Electrician: Like Stuart, Costas is familiar about how to work electronics and machines, which helps Stuart properly create a new Seklos' cannon.


  • Mortality: As a human, Costas possesses a mortal body, so is therefore highly vulnerable to any forms of injuries, sicknesses, and death.


  • Neurometer Blaster: Like the other soldiers of Area 49-B, Costas wields a blaster as his primary weapon.



Aja, Krel, and Varvatos[]

At first, Costas saw them as mere aliens he had to detain under orders of Kubritz.

However, in "Asteroid Rage", he genuinely appreciated the Akiridions' hard work of saving the country from a giant asteroid. He was even surprised when Kubritz went back on her deal she made with them earlier. After failing to try and help Kubritz see the error of her ways, Costas turns to the Akiridions, despite knowing their reluctance of trusting him after everything he and Kubritz put them through.

However, they gain his trust when he warns them of Kubritz and Morando's plans. He even helps them build Seklos' cannon and fight off the Omen Blanks attacking Arcadia.

Toby Domzalski[]

Toby and Costas barely interact with each other, but Costas was suspicious of Toby when he catches him sneaking towards the Mothership in his armor.

Later on, after Costas switches to the side of good, he saves Toby from an Omen Blank and they both try to get the people of Arcadia to safety when Morando attacks.


After presumably resigning his position at Area 49-B, Costas becomes Stuart's employee after he helps him build Seklos' Cannon.


Colonel Kubritz[]

Costas is Colonel Kubritz's second-in-command of Area 49-B. At first, they had a good professional relationship with each other.

However, after seeing Colonel Kubritz traveling further and further down the road of insanity as she sells herself to Morando, he couldn't take it anymore. He ultimately turns on her after realizing that she has gone completely mad for more power.

General Morando[]

Costas was instantly skeptic and fearful of Kubritz's alliance with Morando. He even believes that their alliance is like a "deal with the devil".


Main article: Sergeant Costas/Quotes

Episode Appearances[]


3Below Part 1
"Terra Incognita Part One"
"Terra Incognita Part Two"
"Mind Over Matter"
"Beetle Mania"
"Collision Course"
"D'aja Vu"
"Flying the Coop"
"Party Crashers"
"Lightning in a Bottle"
"The Arcadian Job"
"Truth Be Told"
"Last Night on Earth"
"Bad Omen"
3Below Part 2
"Moving Day"
"Moonlight Run"
"Dogfight Days of Summer"
"Mother's Day"
"Ill Gotten Gains"
"There's Something About Gwen (of Gorbon)"
"Asteroid Rage"
"Luug's Day Out"
"The Fall of House Tarron"
"The Big Sleep"
"Race to Trollmarket"
"A Glorious End, Part One"
"A Glorious End, Part Two"


  • It's currently unknown what Costas's first name is.
  • Costas is the second henchman to defect to the side of good, the first being Dictatious.
    • However, unlike Dictatious (who reformed merely out of fear for his life), Costas did out of genuine morality when he finally believed that Kubritz was far beyond reasoning with.


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Arcadia Oaks-pedia has a collection of images and media related to Sergeant Costas which can be found at Sergeant Costas/Gallery.