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The Citadel is a nastisized prison, only the worst of the worst end up there. Real stink-faces. These guys are the pits, the armpits.

—Prismo

The Citadel Prisoners, also referred to as The Ancients (by the Lich) or Cosmic Criminals, are a group of various inter-dimensional beings that have committed Cosmic Crimes. Their punishment for committing these cosmic-scale offenses is imprisonment in Crystal Citadel, where they are imprisoned inside of pink crystals by the Citadel Guardians. After the events in the episode "Escape from the Citadel", all of the criminals were freed. By the time of "Prismo the Wishmaster" however, Scarab had neutralized the Void Caster at the very least, implying that he was hunting all of them down after the Citadel's destruction.

Overview[]

In the episode "Wake Up", Cosmic Prisoners were first discussed in the episode Wake Up after Finn asked Prismo where his father was, Prismo revealing that he was imprisoned at the Crystal Citadel. Prismo then went on to explain how the prisoners located here were the worst of the worst, and the only way to get there would be to commit a cosmic crime. Prismo intended to have Finn and Jake wake up his physical form, but the Lich ended up doing it instead. Finn and Jake found themselves at the Citadel where various prisoners could be seen, including the Lich.

In the episode "Escape from the Citadel", the Lich used his powers to melt the crystals and free the other criminals. After some of the prisoners touched the gray substance that the Lich was summoning, they themselves turned gray and presumably came under his control. The criminals immediately began to cause havoc, which was quickly noticed by the Guardians, who immediately began to open fire. This did kill some of the criminals, but the rest managed to escape through a portal cast by a Void Caster.

During the episode, the Lich revealed that he was planning to use the prisoners to form an army that would travel throughout the universe until "every light was extinguished". This was all foiled after Finn healed him with the Guardians white goo.

List of Citadel Prisoners[]

Name Image Description

The Lich

Accuratelich
The Lich, in his Billy-form, was imprisoned in the Crystal Citadel after killing Prismo in his physical form. He did this in order to escape imprisonment from the Time Room. Shortly after arriving, the Lich was able to escape imprisonment by using his powers to melt the crystals and free all of the other prisoners.

Martin Mertens

Martinrender
Martin was one of the many creatures imprisoned at the Crystal Citadel. After finding out that he was there Finn asked Prismo to help him commit a cosmic crime in order to get there. Shortly after Finn and Jake arrived, Martin was freed by the power of the Lich, and escaped with a group of other prisoners.

Void Caster

S6e2 Void Caster
The Void Caster was a former prisoner that was freed by the Lich in the episode Escape from the Citadel. At the end of the episode, it used its powers to cast a portal to an unknown location after it was asked to do so by Martin.

Head-Devouring Creature

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This entity was first seen in the episode Wake Up during a flashback where it used a hole at the top of its body to devour the heads of a group of Bland Alien Creatures. In the episode Escape from the Citadel, it escaped its imprisonment and caused havoc with some of the other criminals. It appears to be a green humanoid creature without a head.

Half-Bodied Creature

8B8F609B-21EC-40AA-9EC0-54675E550E73
Seen running in the episode Escape from the Citadel after being freed by the Lich. It appears to be an oval with spikes on it and two humanoid legs.

Mouth Creatures

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Four-legged prisoners that escaped the Citadel after being freed by the Lich in the episode Escape from the Citadel. They appear to be four legged creatures with tentacles on their heads and mouths all over their bodies.

Spikey Creature

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One of the many prisoners seen walking around the Citadel after being freed by the Lich in the episode Escape from the Citadel. It was killed after being shot at by a Guardians laser. It appeared to be a creature with spikes on it’s body, and it only has two legs.

Tentacle Creature

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One of the many prisoners freed by the Lich. It escaped with Martin and a group of other prisoners in the episode Escape from the Citadel. It appears to be a yellowish-green creature with four tentacles and a round body with a divot at the top.

Arch Creature

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This creature was seen escaping the Citadel after being freed by the Lich, inching its body like an inch-worm in order to move. It was seen escaping with Martin and a group of other cosmic creatures at the end of Escape from the Citadel. It appears to be a creature that appears to be an orange arch shape with some spikes on their legs and around its mouth hole. They also have a triangle shape in the middle of them.

Bacteria-Like Creatures

61B6E3F8-D450-4BA0-B8FA-EF14A13C3EB5
Gaint bacteria-like prisoners that were freed by the Lich in the episode Escape from the Citadel. They appear to look like a giant red bacteria with hair-like tentacles.

Anemone-Like Creature

53F0F61B-6656-48E1-AFDB-4CBC07BE27C4
A prisoner that was freed by the Lich and then thrown into the liquified crystals by two other prisoners in the episode Escape from the Citadel. It appears to be a a giant, blue, anemone-like creature.

Bat-Like Creature

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The Cosmic Bat is one of the many creatures that escaped the Citadel after being freed by the Lich's powers in the episode Escape from the Citadel. It escaped with a group of prisoners through a portal. It appears to be a blue bat-like creature with green wings.

Humanoid Creature

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One of the former prisoners that was freed by the Lich. It was seen helping another prisoner throw an anemone-like creature into the liquified crystals. It was killed after being shot at by a Guardians laser. It appeared to be a humanoid creature with one eye and no hands.

Jellyfish-Like Creature

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Multipe Jellyfish-like creatures that were seen imprisoned near the Lich. They were seen in the episode Escape from the Citadel. One of them could be seen trying to wriggle out of its former imprisonment after being freed by the Lich.

Cone Robot Creature

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A blue cone-like creature with four pink eyes and a mouth that shoots lasers. It was seen during a flashback using its laser abilities to cut a planet into pieces in the episode Wake Up. In the episode Escape from the Citadel, it was seen as one of the many creatures that was imprisoned in the citadel.

Mouth-Belly Creature

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The Mouth-Belly Creature is a prisoner that first appeared during a flashback in the episode Wake Up. During the flashback, it was seen grading a test with smoke coming out of its mouth. In the episode Escape form the Citadel, it was seen beating a Guardian with a crystal. It is a round, orange, and donut-like creature with a hole in the center of its body filled with teeth. It also possesses humanoid limbs.

UFO

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One of the many prisoners freed by the Lich in the episode Escape from the Citadel. It was seen helping another prisoner beet one of the Guardians in the head. It appears to be a UFO-like creature with a wire on the bottom of its body that act like limbs.

Urchin-Like Creatures

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Giant Urchin-like creatures that were seen imprisoned in the episode Escape from the Citadel.

Worm-Like Creature

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A long, blue, worm-like creature with a body made out of circles and pincers for a mouth. It was seen in the episode Escape from the Citadel helping other prisoners to escape through a portal. It used its pincers to cut the white cord that was connecting the platform they were using to escape to the Citadel.

Gallery[]

Trivia[]

  • The fate of the creates after they passed through the portal is unknown, although Martin was shown to have survived, as evidenced when he appeared in later episodes.
  • A Void Caster and the Bat Creature (although with leaf-like wings) appeared in the Distant Lands episode "BMO". It is possible that these are separate creatures, as Marvin referred to Void Caster as a Void Caster rather than the Void Caster. In addition, there Void Caster that was imprisoned at the Citadel wore a plane cloth rather than a detailed one, and both of these characters originally had color before being turned gray by The Lich (the two in BMO appearing to be gray and not their original colors.)
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