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Not to be confused with the Knights of the Round Table.

The Knights of the Underworld (黄泉の騎士団 Yomi no kishi-dan?, lit. "Chivalric Order of the Underworld") are a supernatural species that appear in Sonic and the Black Knight. They are hostile phantoms from the underworld given physical form through armor who work under King Arthur and later Merlina the Wizard. They serve as the enemies fought during the game's various Missions.



The Knights of the Underworld are phantoms of black magic with no body to speak of. Instead, they wear pieces of armor which are completely empty inside, to gain physical shape.[1][2]

The Knights of the Underworld can take a vast array of different forms with their armor. The majority of them resemble humanoid beings while others tends to resemble sea creatures, such as fishes, sea slugs and crabs (one type even takes the shape of treasure chests). However, besides each wearing metallic armor, common features the Knight of the Underworld share are that they each have a single pink glowing medieval symbol on their bodies, as well as an almost slit-like black pupil.

If taking King Arthur into account, it is possible the Knights of the Underworld can appear completely human. However, it is unknown if this occurs naturally or is created artificially through magic, such as when Merlin created Arthur.

Characteristics and culture[]

The Knights of the Underworld are seemingly mindless, appearing as non-sentient drones who unquestionably follows the orders of whoever currently bears the Scabbard of Excalibur. On their own, though, they are quite hostile and aggressive as they usually attack any threats.

Powers and abilities[]

All Knights of the Underworld are able to teleport to different locations by emerging from black voids. Humanoid variants tend to be good at using weapons, such as swords, spears, axes and crossbows, though one variant of this type can also possess super strength. The sea creature-like type is capable of shooting energy blasts, the majority of which have their own effects. Also, the Fish-One variety and a few others are capable of flight thanks to their anatomy.

Whenever a Knight of the Underworld is defeated, it completely dissolves into thin air.


Following King Arthur's turn to evil due to the scabbard of Excalibur, the fallen king began summoning the Knights of the Underworld from their habitat to help him enslave his kingdom by force, plunging it into a world of horror and chaos in the process. When summoning the Knights of the Underworld, King Arthur would use his sword, Deathcalibur.

When Sonic the Hedgehog were called into the world of Camelot to stop Arthur by Merlina the Wizard, he faced hordes of the Knights of the Underworld in his quest to get the means to defeat Arthur. After Sonic had finally defeated Arthur, he discovered that Arthur was a form of illusionary Knight of the underworld, created by Merlin. When Merlina then betrayed Sonic, she apparently took control of the Knights of the Underworld and used them to keep Sonic and the Knights of the Round Table from interfering with her plans to make the kingdom eternal, though at an immeasurable cost. Following Merlina's defeat at Sonic's hands, it is unknown what happened to the Knights of the Underworld afterwards.

List of Knights of the Underworld[]

In other media[]

Books and comics[]

Archie Comics[]

Knights of the Underworld Archie

Knights pour out from the Underworld, from Sonic the Hedgehog #197.

The Knights of the Underworld appear in the Sonic the Hedgehog comic series published by Archie Comics. They are a species that live in the Underworld and makes their sole appearance in the adaptation of Sonic and the Black Knight's opening cinematic.[3]

In this continuity, they are beings from another Zone connected to the "In Another Time, In Another Place" reality in the multiverse.

The corrupted knights were summoned for support by King Arthur to corner the fleeing royal wizard, Merlina the Wizard. However, they were all destroyed by Sonic the Hedgehog without a moment of hesitation.


  • It should be noted that the Knights of the Underworld appear impervious to the Homing Jump, which can destroy Flappers, indicating that it is the magical power of sacred swords which banishes them as opposed to mere physical damage. The Knights can also be defeated with strong sunlight reflected off Caliburn's blade, as seen in Crystal Cave.
    • However, as seen in the opening of Sonic and the Black Knight, Sonic was able to destroy a group of the Knights of the Underworld by blasting through them at high speed, contradicting their invulnerability to physical strikes.


  1. "These phantoms from the Underworld have no bodies to speak of–they're given shape by the pieces of armor they wear. When Sonic runs across one of these footsoldiers, he never knows what kind of threat he's facing, as their weapons, tactics, and roles vary" - Description of the Soldier-Ones, Sonic and the Black Knight US website.
  2. Sonic Team (13 March 2009). Sonic and the Black Knight. Wii. Sega. Area/Level: Gallery, Vault 1. "Enemy 01: Image of the Knight of the Underworld, a Soldier-Ones. There appears to be nothing inside the armor."
  3. Sonic the Hedgehog #197, "Knight Time"